diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4eb7794a30093704914a4c645ad43b8537d04d0b..6817020fcabf4b7551e264709fc89cc487e4f0a0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -102,18 +102,13 @@ build-testenv:
 #   stage: deploy
 
 # Special job for serving a static website. See https://docs.gitlab.com/ee/ci/yaml/README.html#pages
-pages:
-  tags: [ docker ]
+pages_prepare: &pages_prepare
+  tags: [ cached-dind ]
   stage: deploy
   only:
     refs:
       - /^release-.*$/i
-      - master
-    variables:
-      # run pages only on gitlab.com
-      - $CI_SERVER_HOST == "gitlab.com"
   script:
-      # TODO is this a good location here?
     - npm install jsdoc
     - npm install jsdoc-sphinx
     - echo "Deploying"
@@ -122,3 +117,8 @@ pages:
   artifacts:
     paths:
       - public
+pages:
+  <<: *pages_prepare
+  only:
+    refs:
+      - main
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b85b3be264d74a67fdce9e2d8eb0cba3de33b2d..a08df41984aecb0f2a0f32bb5f9b3b05da096e22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,17 +8,49 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added (for new features, dependecies etc.)
 
+- `ext_applicable` module for building fancy features which append
+  functionality to entities (EXPERIMENTAL).
+- `ext_cosmetics` module which converts http(s) uris in property values into
+  clickable links.
+- Added a menu/toc for the tour
+- Added a previous and next buttons for pages in the tour
+- Added warnings to inform about minimum width when accessing tour and
+  edit mode on small screens.
+- Added a tutorial for the edit mode to the documentation
+
 ### Changed (for changes in existing functionality)
 
-### Deprecated (for soon-to-be removed features) 
+- Updated from bootstrap 3 to bootstrap 5. This is a major change which will
+  possibly break existing custom implementations (e.g. a custom welcome page)
+  since a lot of classes where renamed by bootstrap an other classes have been
+  dropped entirely (e.g. "jumbotron"). Please have a look at
+    * https://getbootstrap.com/docs/5.0/migration/
+    * https://getbootstrap.com/docs/4.6/migration/
+
+### Deprecated (for soon-to-be removed features)
+
+- css-class `.caosdb-property-text-value`. Please use
+  `.caosdb-f-property-text-value` or `.caosdb-v-property-text-value` instead.
 
 ### Removed (for now removed features)
 
+* `#subnav` element from navbar which was previously used for spacing
+* `caosdb.form.ready` event
+
 ### Fixed
 
+- #212 - form_elements: Drop-down menu shows wrong value after clicking "None"
+- #202 - Make filter fields in edit mode toolbox visible
+- #117 - Reload data model after adding an RT or a Property
+- #214 - Paging panel is hidden.
+- Displaying issues with long lists in property values
+- An issue whereby a grey container would appear above the map when
+  changing the map view.
+- #200 - Re-enabled the file-upload button
+
 ### Security (in case of vulnerabilities)
 
-## [0.3.1]- 2021-06-15
+## [v0.3.1]- 2021-06-15
 
 This is the last Bootstrap-3 compatible release.
 
@@ -33,8 +65,7 @@ This is the last Bootstrap-3 compatible release.
   the module documentation for more information.
 
 ### Changed (for changes in existing functionality)
-
-- The heading attributes datatype, path, checksum and size are now placed 
+- The heading attributes datatype, path, checksum and size are now placed
   in a `details` html element.
 
 ### Deprecated (for soon-to-be removed features)
@@ -57,7 +88,7 @@ This is the last Bootstrap-3 compatible release.
 
 ### Security (in case of vulnerabilities)
 
-## [0.3.0] - 2021-02-10
+## [v0.3.0] - 2021-02-10
 
 ### Added (for new features, dependecies etc.)
 
@@ -87,7 +118,7 @@ This is the last Bootstrap-3 compatible release.
 - enabled and enhanced autocompletion
 * Login form is hidden behind another button.
 
-### Deprecated (for soon-to-be removed features) 
+### Deprecated (for soon-to-be removed features)
 
 ### Removed (for now removed features)
 
@@ -112,7 +143,7 @@ This is the last Bootstrap-3 compatible release.
 
 ### Changed (for changes in existing functionality)
 
-### Deprecated (for soon-to-be removed features) 
+### Deprecated (for soon-to-be removed features)
 
 ### Removed (for now removed features)
 
@@ -150,7 +181,7 @@ This is the last Bootstrap-3 compatible release.
   See the doc string of that method for more information.
 - added a layout argument to the create_plot function of ext_bottom_line
 
-### Deprecated (for soon-to-be removed features) 
+### Deprecated (for soon-to-be removed features)
 
 * css class `caosdb-property-text-value` is deprecated because different
   functionality interpreted it differently and most of the uses of this class
@@ -240,20 +271,20 @@ This is the last Bootstrap-3 compatible release.
 * updated QUnit test framework to 2.9.2
 
 
-### Deprecated (for soon-to-be removed features) 
+### Deprecated (for soon-to-be removed features)
 
 * Image Preview in the FileSystem. The functionality is to be replaced by real
   thumbnails, which cover also non-image data-formats. The thumbnails resource
   is part of the new file system API of the CaosDB Server which is currently
   under development.
 
-### Removed (for now removed features) 
+### Removed (for now removed features)
 
 * Removed non-informative tests for webcaosdb.css
 * Hard-coded image and video preview in the entity panel. The preview of images
   and videos is controlled by the `ext_bottom_line` module now.
 
-### Fixed (for any bug fixes) 
+### Fixed (for any bug fixes)
 
 * #95 - Edit Mode removes property values of reference properties when server
   response for possible reference targets is empty.
diff --git a/Makefile b/Makefile
index 1f182e7864a2252e4c1263cde7fa4238d31a4269..0aa47756d72dcfcaff88efb673b5fa5044f8e05a 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,8 @@ LIBS_DIR = $(abspath libs)
 TEST_CORE_DIR = $(abspath test/core/)
 TEST_EXT_DIR = $(abspath test/ext)
 TEST_SSS_DIR =$(abspath test/server_side_scripting)
-LIBS = fonts css/bootstrap.css js/bootstrap.js js/state-machine.js js/jquery.js js/showdown.js js/dropzone.js css/dropzone.css js/loglevel.js js/leaflet.js css/leaflet.css css/images js/leaflet-latlng-graticule.js js/proj4.js js/proj4leaflet.js js/leaflet-coordinates.js css/leaflet-coordinates.css js/leaflet-graticule.js js/bootstrap-select.js css/bootstrap-select.css js/bootstrap-autocomplete.min.js js/plotly.js js/pako.js js/utif.js
+LIBS = fonts css/fonts css/bootstrap.css css/bootstrap-icons.css js/state-machine.js js/jquery.js js/showdown.js js/dropzone.js css/dropzone.css js/loglevel.js js/leaflet.js css/leaflet.css css/images js/leaflet-latlng-graticule.js js/proj4.js js/proj4leaflet.js js/leaflet-coordinates.js css/leaflet-coordinates.css js/leaflet-graticule.js js/bootstrap-select.js css/bootstrap-select.css js/bootstrap-autocomplete.min.js js/plotly.js js/pako.js js/utif.js js/bootstrap.js
+
 
 TEST_LIBS = $(LIBS) js/qunit.js css/qunit.css $(subst $(TEST_CORE_DIR)/,,$(shell find $(TEST_CORE_DIR)/))
 
@@ -52,9 +53,9 @@ LIBS_SUBDIRS = $(addprefix $(LIBS_DIR)/, js css fonts)
 
 ALL: install
 
-install: clean install-sss cp-src cp-ext cp-conf $(addprefix $(PUBLIC_DIR)/, $(LIBS)) build_properties merge_xsl
+install: clean-ignore-zips install-sss cp-src cp-ext cp-conf $(addprefix $(PUBLIC_DIR)/, $(LIBS)) merge_js build_properties merge_xsl
 
-test: clean install-sss cp-src cp-ext cp-ext-test cp-conf $(addprefix $(PUBLIC_DIR)/, $(TEST_LIBS)) build_properties merge_xsl
+test: clean-ignore-zips install-sss cp-src cp-ext cp-ext-test cp-conf $(addprefix $(PUBLIC_DIR)/, $(TEST_LIBS)) merge_js build_properties merge_xsl
 	@for f in $(shell find $(TEST_EXT_DIR) -type f -iname *.js) ; do \
 		sed -i "/EXTENSIONS/a \<script src=\"$${f#$(TEST_EXT_DIR)/}\" ></script>" $(PUBLIC_DIR)/index.html ; \
 		echo include $$f; \
@@ -67,6 +68,10 @@ test: clean install-sss cp-src cp-ext cp-ext-test cp-conf $(addprefix $(PUBLIC_D
 merge_xsl:
 	misc/merge_xsl.sh
 
+merge_js:
+	for f in ${BUILDFILELIST} ; do source "$$f" ; done ; \
+	JS_DIST_BUNDLE=$${JS_DIST_BUNDLE} AUTO_DISCOVER_MODULES=$$AUTO_DISCOVER_MODULES misc/merge_js.sh $${MODULE_DEPENDENCIES[*]}
+
 EXCLUDE_EXPR = %~ %.backup
 BUILDFILELIST = $(filter-out $(EXCLUDE_EXPR),$(wildcard build.properties.d/*))
 build_properties:
@@ -91,24 +96,24 @@ build_properties:
 	@ln -s $(PUBLIC_DIR) $(PUBLIC_DIR)/$(BUILD_NUMBER)
 	@ln -s $(PUBLIC_DIR) $(PUBLIC_DIR)/webinterface
 
-PORT = 8000
+TEST_PORT ?= 8000
 TIMEOUT = 60
 run-test-server: test
-	$(MISC_DIR)/unit_test_http_server.py $(PORT) $(TIMEOUT) False $(PUBLIC_DIR)
+	$(MISC_DIR)/unit_test_http_server.py $(TEST_PORT) $(TIMEOUT) False $(PUBLIC_DIR)
 
 keep-test-server: test
-	$(MISC_DIR)/unit_test_http_server.py $(PORT) -1 True $(PUBLIC_DIR)
+	$(MISC_DIR)/unit_test_http_server.py $(TEST_PORT) -1 True $(PUBLIC_DIR)
 
 run-qunit: test
 	$(foreach exec, firefox Xvfb xwd,\
 	    $(if $(shell which $(exec)),echo "found $(exec)",$(error "No $(exec) in PATH")))
 
 	# start server in background
-	$(MISC_DIR)/unit_test_http_server.py $(PORT) $(TIMEOUT) False $(PUBLIC_DIR) &
+	$(MISC_DIR)/unit_test_http_server.py $(TEST_PORT) $(TIMEOUT) False $(PUBLIC_DIR) &
 
 	# start firefox with virtual xserver
 	Xvfb :1 -screen 0 1024x768x24 &
-	DISPLAY=:1 firefox "http://localhost:$(PORT)/?hidepassed" &
+	DISPLAY=:1 firefox "http://localhost:$(TEST_PORT)/?hidepassed" &
 
 	while [ 1 -eq 1 ]; do \
 		sleep 5 ; \
@@ -211,22 +216,25 @@ $(PUBLIC_DIR)/%: $(TEST_EXT_DIR)/%
 	cp -r $< $@
 
 $(LIBS_DIR)/fonts: unzip
-	ln -s $(LIBS_DIR)/bootstrap-3.4.1-dist/fonts $@
+	ln -s $(LIBS_DIR)/bootstrap-icons-1.4.1/fonts/ $@
 
 $(LIBS_DIR)/js/bootstrap.js: unzip $(LIBS_DIR)/js
-	ln -s $(LIBS_DIR)/bootstrap-3.4.1-dist/js/bootstrap.min.js $@
+	ln -s $(LIBS_DIR)/bootstrap-5.0.1-dist/js/bootstrap.bundle.min.js $@
 
 $(LIBS_DIR)/css/bootstrap.css: unzip $(LIBS_DIR)/css
-	ln -s $(LIBS_DIR)/bootstrap-3.4.1-dist/css/bootstrap.min.css $@
+	ln -s $(LIBS_DIR)/bootstrap-5.0.1-dist/css/bootstrap.min.css $@
+
+$(LIBS_DIR)/css/bootstrap-icons.css: unzip $(LIBS_DIR)/css
+	ln -s $(LIBS_DIR)/bootstrap-icons-1.4.1/bootstrap-icons.css $@
 
 $(LIBS_DIR)/js/bootstrap-select.js: unzip $(LIBS_DIR)/js
-	ln -s $(LIBS_DIR)/bootstrap-select-1.13.9/dist/js/bootstrap-select.min.js $@
+	ln -s $(LIBS_DIR)/bootstrap-select-1.14.0-beta2/js/bootstrap-select.min.js $@
 
 $(LIBS_DIR)/css/bootstrap-select.css: unzip $(LIBS_DIR)/css
-	ln -s $(LIBS_DIR)/bootstrap-select-1.13.9/dist/css/bootstrap-select.min.css $@
+	ln -s $(LIBS_DIR)/bootstrap-select-1.14.0-beta2/css/bootstrap-select.min.css $@
 
 $(LIBS_DIR)/js/jquery.js: unzip $(LIBS_DIR)/js
-	ln -s $(LIBS_DIR)/jquery-3.5.1/jquery-3.5.1.min.js $@
+	ln -s $(LIBS_DIR)/jquery-3.6.0.min.js $@
 
 $(LIBS_DIR)/js/showdown.js: unzip $(LIBS_DIR)/js
 	ln -s $(LIBS_DIR)/showdown-1.8.6/dist/showdown.min.js $@
@@ -261,6 +269,9 @@ $(LIBS_DIR)/css/images: unzip $(LIBS_DIR)/css
 $(LIBS_DIR)/js/leaflet-graticule.js: unzip $(LIBS_DIR)/js
 	ln -s $(LIBS_DIR)/L.Graticule.js $@
 
+$(LIBS_DIR)/js/bootstrap.bundle.min.js: unzip $(LIBS_DIR)/js
+	ln -s $(LIBS_DIR)/bootstrap.bundle.min.js $@
+
 $(LIBS_DIR)/js/leaflet-latlng-graticule.js: unzip $(LIBS_DIR)/js
 	ln -s $(LIBS_DIR)/leaflet.latlng-graticule-20191007/leaflet.latlng-graticule.js $@
 
@@ -292,17 +303,23 @@ $(LIBS_DIR)/js/utif.js: unzip $(LIBS_DIR)/js
 $(addprefix $(LIBS_DIR)/, js css):
 	mkdir $@ || true
 
-.PHONY: clean
-clean:
+$(LIBS_DIR)/css/fonts: $(LIBS_DIR)/css
+	ln -s $(LIBS_DIR)/fonts/ $(LIBS_DIR)/css/fonts
+
+.PHONY: clean-ignore-zips
+clean-ignore-zips:
 	$(RM) -r $(SSS_BIN_DIR)
 	$(RM) -r $(PUBLIC_DIR)
 	for f in $(LIBS_SUBDIRS); do unlink $$f || $(RM) -r $$f || true; done
-	for f in $(patsubst %.zip,%/,$(LIBS_ZIP)); do $(RM) -r $$f; done
 	$(RM) .server_done
 
+.PHONY: clean
+clean: clean-ignore-zips
+	for f in $(patsubst %.zip,%/,$(LIBS_ZIP)); do $(RM) -r $$f; done
+
 .PHONY: unzip
 unzip:
-	for f in $(LIBS_ZIP); do unzip -q -o -d libs $$f; done
+	for f in $(LIBS_ZIP); do echo "unzip $$f" ; unzip -u -q -o -d libs $$f; done
 
 
 PYLINT ?= pylint
diff --git a/README.md b/README.md
index 5abbfafe8f45ad430e91d66ddd50f055cad61a25..dca645c4244573ae31c7e0072208b53a47cec1d2 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,9 @@ when creating the merge request. This allows our team to work with you on your r
 - If you have a suggestion for the [documentation](https://docs.indiscale.com/caosdb-webui/),
 the preferred way is also a merge request as describe above (the documentation resides in `src/doc`).
 However, you can also create an issue for it.
-- You can also contact us at **info (AT) caosdb.de**.
+- You can also contact us at **info (AT) caosdb.de**  and join the
+  CaosDB community on
+  [#caosdb:matrix.org](https://matrix.to/#/!unwwlTfOznjEnMMXxf:matrix.org).
 
 ## License
 
diff --git a/build.properties.d/00_default.properties b/build.properties.d/00_default.properties
index 482913473a8d2620a4484b69424aab82e52e48f3..58d20c521100bbd43e094c2da402abc38ea555bc 100644
--- a/build.properties.d/00_default.properties
+++ b/build.properties.d/00_default.properties
@@ -50,6 +50,7 @@ BUILD_MODULE_EXT_BOTTOM_LINE=ENABLED
 BUILD_MODULE_EXT_BOTTOM_LINE_TABLE_PREVIEW=DISABLED
 BUILD_MODULE_EXT_BOTTOM_LINE_TIFF_PREVIEW=DISABLED
 BUILD_MODULE_EXT_BOOKMARKS=ENABLED
+BUILD_MODULE_EXT_ANNOTATION=ENABLED
 
 BUILD_MODULE_USER_MANAGEMENT=ENABLED
 BUILD_MODULE_USER_MANAGEMENT_CHANGE_OWN_PASSWORD_REALM=CaosDB
@@ -90,3 +91,61 @@ BUILD_CUSTOM_IMPRINT='<p> Put an imprint note here </p>'
 # ext_trigger_crawler_form properties
 ##############################################################################
 BUILD_MODULE_EXT_TRIGGER_CRAWLER_FORM_TOOLBOX="Tools"
+
+##############################################################################
+# Build a dist file containing all JS code from the files in the
+# MODULE_DEPENDENCIES array.
+##############################################################################
+JS_DIST_BUNDLE=TRUE
+##############################################################################
+# TRUE means that all javascript sources which are no mentioned in the
+# MODULE_DEPENDENCIES array will be added in no particular order into the
+# build. If you need to guarantee a specific order (in which the are loaded or
+# appear in the dit file) you need to add them to the MODULE_DEPENDENCIES.
+##############################################################################
+AUTO_DISCOVER_MODULES=TRUE
+##############################################################################
+# Module dependencies
+# Override or extend to specify the order of js files in the resulting
+# bundled js file
+##############################################################################
+MODULE_DEPENDENCIES=(
+    jquery.js
+    bootstrap.js
+    bootstrap-autocomplete.min.js
+    bootstrap-select.js
+    state-machine.js
+    showdown.js
+    dropzone.js
+    loglevel.js
+    plotly.js
+    webcaosdb.js
+    pako.js
+    utif.js
+    caosdb.js
+    form_elements.js
+    ext_autocomplete.js
+    preview.js
+    ext_references.js
+    ext_applicable.js
+    ext_table_preview.js
+    ext_xls_download.js
+    query_shortcuts.js
+    ext_jupyterdrag.js
+    annotation.js
+    edit_mode.js
+    ext_entity_state.js
+    ext_file_download.js
+    leaflet.js
+    leaflet-graticule.js
+    leaflet-latlng-graticule.js
+    leaflet-coordinates.js
+    proj4.js
+    proj4leaflet.js
+    ext_map.js
+    tour.js
+    ext_bottom_line.js
+    ext_sss_markdown.js
+    ext_trigger_crawler_form.js
+    ext_bookmarks.js
+)
diff --git a/libs/bootstrap-3.4.1-dist.zip b/libs/bootstrap-3.4.1-dist.zip
deleted file mode 100644
index 9002b8521706bc582546f41635da3437edf20c3c..0000000000000000000000000000000000000000
Binary files a/libs/bootstrap-3.4.1-dist.zip and /dev/null differ
diff --git a/libs/bootstrap-5.0.1-dist.zip b/libs/bootstrap-5.0.1-dist.zip
new file mode 100644
index 0000000000000000000000000000000000000000..196a8212a471170f120de352455dbcf9f3466639
Binary files /dev/null and b/libs/bootstrap-5.0.1-dist.zip differ
diff --git a/libs/bootstrap-icons-1.4.1.zip b/libs/bootstrap-icons-1.4.1.zip
new file mode 100644
index 0000000000000000000000000000000000000000..dc9398e6d6e6ce3c96e01b4734a29a37432f43b1
Binary files /dev/null and b/libs/bootstrap-icons-1.4.1.zip differ
diff --git a/libs/bootstrap-select-1.14.0-beta2.zip b/libs/bootstrap-select-1.14.0-beta2.zip
new file mode 100644
index 0000000000000000000000000000000000000000..9d7a97280ee9825b6a23aaddb40d20256a892f85
Binary files /dev/null and b/libs/bootstrap-select-1.14.0-beta2.zip differ
diff --git a/libs/bootstrap-select-v1.13.9.zip b/libs/bootstrap-select-v1.13.9.zip
deleted file mode 100644
index f52eea6450673782ba84504b249d65f3e6f8fa14..0000000000000000000000000000000000000000
Binary files a/libs/bootstrap-select-v1.13.9.zip and /dev/null differ
diff --git a/libs/jquery-3.5.1.zip b/libs/jquery-3.5.1.zip
deleted file mode 100644
index c554bbf416786da9c18bef62061cba932646f996..0000000000000000000000000000000000000000
Binary files a/libs/jquery-3.5.1.zip and /dev/null differ
diff --git a/libs/jquery-3.6.0.min.js b/libs/jquery-3.6.0.min.js
new file mode 100644
index 0000000000000000000000000000000000000000..c4c6022f2982e8dae64cebd6b9a2b59f2547faad
--- /dev/null
+++ b/libs/jquery-3.6.0.min.js
@@ -0,0 +1,2 @@
+/*! jQuery v3.6.0 | (c) OpenJS Foundation and other contributors | jquery.org/license */
+!function(e,t){"use strict";"object"==typeof module&&"object"==typeof module.exports?module.exports=e.document?t(e,!0):function(e){if(!e.document)throw new Error("jQuery requires a window with a document");return t(e)}:t(e)}("undefined"!=typeof window?window:this,function(C,e){"use strict";var t=[],r=Object.getPrototypeOf,s=t.slice,g=t.flat?function(e){return t.flat.call(e)}:function(e){return t.concat.apply([],e)},u=t.push,i=t.indexOf,n={},o=n.toString,v=n.hasOwnProperty,a=v.toString,l=a.call(Object),y={},m=function(e){return"function"==typeof e&&"number"!=typeof e.nodeType&&"function"!=typeof e.item},x=function(e){return null!=e&&e===e.window},E=C.document,c={type:!0,src:!0,nonce:!0,noModule:!0};function b(e,t,n){var r,i,o=(n=n||E).createElement("script");if(o.text=e,t)for(r in c)(i=t[r]||t.getAttribute&&t.getAttribute(r))&&o.setAttribute(r,i);n.head.appendChild(o).parentNode.removeChild(o)}function w(e){return null==e?e+"":"object"==typeof e||"function"==typeof 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diff --git a/misc/install_comment_datamodel.py b/misc/install_comment_datamodel.py
new file mode 100755
index 0000000000000000000000000000000000000000..b8204811d37756c805c9ae8104cd4e58c6f19ab6
--- /dev/null
+++ b/misc/install_comment_datamodel.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# ** header v3.0
+# This file is a part of the CaosDB Project.
+#
+# Copyright (C) 2020 IndiScale GmbH <info@indiscale.com>
+# Copyright (C) 2020 Timm Fitschen <t.fitschen@indiscale.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# ** end header
+
+import sys
+import caosdb as db
+
+
+if len(db.execute_query("FIND RecordType CommentAnnotation")) > 0:
+    print("RecordType CommentAnnotation does exist")
+    sys.exit(1)
+
+comment = db.Property("comment", datatype=db.TEXT).insert()
+annotationOf = db.Property("annotationOf", datatype=db.REFERENCE).insert()
+par = db.RecordType("Annotation")
+par.add_property(annotationOf, importance=db.OBLIGATORY)
+par.insert()
+rt = db.RecordType("CommentAnnotation").add_parent("Annotation",
+                                                   inheritance=db.OBLIGATORY)
+rt.add_property(comment, importance=db.OBLIGATORY)
+rt.insert()
diff --git a/misc/merge_js.sh b/misc/merge_js.sh
new file mode 100755
index 0000000000000000000000000000000000000000..506a65866db42c329b4e19c197842f04bdfc4aca
--- /dev/null
+++ b/misc/merge_js.sh
@@ -0,0 +1,127 @@
+#!/bin/bash
+#
+# ** header v3.0
+# This file is a part of the CaosDB Project.
+#
+# Copyright (C) 2021 IndiScale GmbH
+# Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+# ** end header
+
+# This file can be used to merge js files together.
+#
+# call: `./merge_js.sh [JS_FILE]*`
+#     where the JS_FILE are the files which will be merged into the resulting
+#     `public/webcaosdb.dist.js` in the order they appear in the command line
+#     call. See `Makefile` for an example.
+#
+# All other files in `public/js` are appended to the resulting file in no
+# particular order.
+
+
+CORE_MODULES=$@
+PUBLIC_JS_DIR=public/js/
+DIST_BUNDLE=webcaosdb.dist.js
+DIST_BUNDLE_TARGET=public/${DIST_BUNDLE}
+JSHEADER_TARGET=public/xsl/jsheader.xsl
+ALL_SOURCES=()
+
+_create_jsheader () {
+    _JS_INCLUDE=
+    if [ "$JS_DIST_BUNDLE" == "TRUE" ] ; then
+        _SIZE=$(( $(wc -c ${DIST_BUNDLE_TARGET} | awk '{print $1}')/1024))
+        echo "including ${DIST_BUNDLE} (${_SIZE}kB) into ${JSHEADER_TARGET}"
+        _JS_INCLUDE="
+    <xsl:element name=\"script\">
+      <xsl:attribute name=\"src\">
+        <xsl:value-of select=\"concat(\$basepath,'webinterface/\${BUILD_NUMBER}/${DIST_BUNDLE}')\"/>
+      </xsl:attribute>
+    </xsl:element>
+    "
+        [[ -f "public/index.html" ]] && sed -i "s|^\(.*JS_INCLUDE.*\)$|    <script src=\"${DIST_BUNDLE}\"><\/script>\n\1|g" public/index.html ;
+    else
+        _ALL_SOURCES=$@
+        echo "${_ALL_SOURCES}"
+        for _SOURCE in ${_ALL_SOURCES[@]} ; do
+            _SIZE=$(( $(wc -c ${_SOURCE} | awk '{print $1}')/1024))
+            _SOURCE=js/${_SOURCE/${PUBLIC_JS_DIR}/}
+            echo "including ${_SOURCE} (${_SIZE}kB) into ${JSHEADER_TARGET}"
+            _JS_INCLUDE="${_JS_INCLUDE}
+    <xsl:element name=\"script\">
+      <xsl:attribute name=\"src\">
+        <xsl:value-of select=\"concat(\$basepath,'webinterface/\${BUILD_NUMBER}/${_SOURCE}')\"/>
+      </xsl:attribute>
+    </xsl:element>
+    "
+            sed -i "s|^\(.*JS_INCLUDE.*\)$|    <script src=\"${_SOURCE}\"><\/script>\n\1|g" public/index.html ;
+        done
+    fi
+
+
+    echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+<!-- THIS FILE IS AUTO-GENERATED BY THE merge_js.sh SCRIPT -->
+<xsl:stylesheet version=\"1.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">
+  <xsl:output method=\"html\"/>
+  <xsl:template name=\"caosdb-head-js\">
+    <script>
+        window.sessionStorage.caosdbBasePath = \"<xsl:value-of select=\"\$basepath\"/>\";
+    </script>
+    ${_JS_INCLUDE}
+  </xsl:template>
+</xsl:stylesheet>" > ${JSHEADER_TARGET}
+}
+
+function _merge () {
+    if [ "$JS_DIST_BUNDLE" != "TRUE" ] ; then
+        return 0
+    fi
+    _SOURCE=$2
+    _TARGET=$3
+
+    echo "merging $1 module ${_SOURCE} into ${_TARGET}"
+
+
+    echo "//COPIED FROM ${_SOURCE} (START)" >> ${_TARGET}
+    cat ${_SOURCE} >> ${_TARGET}
+    echo "//COPIED FROM ${_SOURCE} (END)" >> ${_TARGET}
+
+    rm ${_SOURCE}
+}
+
+# clean up old
+rm $DIST_BUNDLE_TARGET || true
+touch $DIST_BUNDLE_TARGET
+
+for _SOURCE in ${CORE_MODULES[@]} ; do
+    [[ ! " ${ALL_SOURCES[@]} " =~ " ${_SOURCE} " ]] && ALL_SOURCES+=(${PUBLIC_JS_DIR}${_SOURCE})
+    _merge "core" "${PUBLIC_JS_DIR}${_SOURCE}" $DIST_BUNDLE_TARGET
+done
+
+if [ "$AUTO_DISCOVER_MODULES" == "TRUE" ] ; then
+    # load other js files but exclude any subdirectory
+    for _SOURCE in $(find ${PUBLIC_JS_DIR}* -prune -iname "*.js") ; do
+        [[ ! " ${ALL_SOURCES[@]} " =~ " ${_SOURCE} " ]] && ALL_SOURCES+=(${_SOURCE})
+        _merge "extension" ${_SOURCE} $DIST_BUNDLE_TARGET
+    done
+fi
+
+# for `make test`
+for _SOURCE in $(find ${PUBLIC_JS_DIR} -ipath "${PUBLIC_JS_DIR}modules/*.js") ; do
+    [[ ! " ${ALL_SOURCES[@]} " =~ " ${_SOURCE} " ]] && ALL_SOURCES+=(${_SOURCE})
+    _merge "extension" ${_SOURCE} $DIST_BUNDLE_TARGET
+done
+
+_create_jsheader ${ALL_SOURCES[@]}
diff --git a/misc/merge_xsl.sh b/misc/merge_xsl.sh
index 07cc6d7ce8dc690eaa58ad8a42e6c883e5eda149..abf95444de1ca550f5cd66ae1f02e2f0587503f0 100755
--- a/misc/merge_xsl.sh
+++ b/misc/merge_xsl.sh
@@ -30,7 +30,7 @@
 
 
 SOURCE_DIR=public/
-MERGE="xsl/footer.xsl xsl/filesystem.xsl xsl/entity.xsl xsl/query.xsl xsl/messages.xsl xsl/navbar.xsl xsl/main.xsl xsl/welcome.xsl xsl/common.xsl"
+MERGE="xsl/jsheader.xsl xsl/footer.xsl xsl/filesystem.xsl xsl/entity.xsl xsl/query.xsl xsl/messages.xsl xsl/navbar.xsl xsl/main.xsl xsl/welcome.xsl xsl/common.xsl"
 TARGET=public/webcaosdb.xsl
 
 
diff --git a/misc/unit_test_http_server.py b/misc/unit_test_http_server.py
index 68e6a7434a584a26a242e5891329f3fb6c6d159f..56205df8d34491b865698742f6b24b1679894df8 100755
--- a/misc/unit_test_http_server.py
+++ b/misc/unit_test_http_server.py
@@ -153,5 +153,5 @@ class UnitTestHTTPServer(HTTPServer):
         os._exit(self._exit_code)#pylint: disable=protected-access
 
 
-UnitTestHTTPServer(server_address=('127.0.0.1', int(sys.argv[1])),
+UnitTestHTTPServer(server_address=('0.0.0.0', int(sys.argv[1])),
                    timeout=float(sys.argv[2]), ignore_done=(sys.argv[3] == "True")).start()
diff --git a/src/core/css/tour.css b/src/core/css/tour.css
index 3bb471369b698981f49858b8127652e957a11f8d..beec314ff8f8aa944e1fbb1fd9efd20e1fb17aa5 100644
--- a/src/core/css/tour.css
+++ b/src/core/css/tour.css
@@ -29,40 +29,44 @@
     width: 5em;
     /* line-height: 50px; */
 }
-.caosdb-v-tour-button.small {
-    height: 2em;
-    width: 2em;
+.caosdb-v-tour-button {
+    height: 1.5em;
+    width: 1.5em;
     /* line-height: 30px; */
 }
-    
+
 .caosdb-v-tour-highlight {
     background-color: #ff593c !important;
     color: white !important;
     animation: color-change 1s 2;
 }
+
 .caosdb-v-tour-highlighter {
     color: #ff593c;
     animation: color-change 1s 3;
 }
 
+.caosdb-v-tour-highlighter a:hover {
+    color: #212529;
+}
+
 @keyframes color-change {
-	  0% {
+    0% {
         box-shadow: 0 0 0 0 #ff593c;
-	  }
-	  50% {
+    }
+    50% {
         box-shadow: 0 0 1em 0.5em #ff593c;
-	  }
-	  100% {
+    }
+    100% {
         box-shadow: 0 0 0 0 #ff593c;
-	  }
+    }
 }
 .caosdb-v-tour-menu-entry-highlight {
-    background-color: #ff593c !important;
+    background-color: #348187 !important;
     color: white !important;
 }
 .caosdb-f-tour-menu-entry {
     background-color: #ff593c;
-    color: white !important;
 }
 .caosdb-f-tour-menu-entry:hover {
     background-color: transparent;
@@ -88,9 +92,11 @@
 /*}*/
 .caosdb-f-tour-overview-entry.caosdb-v-tour-overview-entry-pageset {
 }
+/*
 .caosdb-f-tour-overview-entry.caosdb-v-tour-overview-entry-page {
   display: none;
 }
+*/
 li.list-group-item > ul.list-group {
   margin-bottom: 0px;
 }
@@ -155,3 +161,97 @@ li.list-group-item > .btn {
     color: LightSeaGreen;
 }
 
+.caosdb-v-tour-overview {
+    padding: 0px;
+}
+
+.caosdb-v-tour-toc-sidebar {
+    height: 100%;
+    width: 200px;
+    position: fixed;
+    top: 0;
+    left: 0;
+    background-color: #1a4548;
+    color: #e1eff0;
+    overflow-x: hidden;
+    padding-top: 20px;
+    visibility: hidden;
+}
+
+.caosdb-v-tour-toc-sidebar a {
+    color: #e1eff0;
+}
+
+.caosdb-v-tour-toc-sidebar a:hover {
+    color: #212529;
+}
+
+body.tour-sidebar-visible .caosdb-v-tour-toc-sidebar {
+    visibility: visible;
+}
+
+body.tour-sidebar-visible {
+    margin-left: 200px;
+}
+
+.caosdb-v-tour-toc-active-item {
+    background-color: #a1c4c6;
+}
+
+.caosdb-v-tour-toc-active-item a {
+    color: #333;
+}
+
+.caosdb-v-tour-toc-pageset {
+    width: 100%;
+    text-align: left;
+    color: #e1eff0;
+}
+.caosdb-v-tour-pn-btn {
+    width:6em;
+}
+
+button.caosdb-v-tour-toc-show {
+    position: fixed;
+    top: calc(50vh - 12px);
+    left: -2px;
+    padding: 0;
+    margin: 0;
+    border: none;
+    transform: rotate(45deg);
+    width: 24px;
+    height: 24px;
+    background-color: #1a4548;
+    visibility: hidden;
+    z-index: 100000;
+}
+
+div.caosdb-v-tour-toc-show {
+    background-color: #1a4548;
+    visibility: hidden;
+    width: 12px;
+    height: 100%;
+    position: fixed;
+    padding: 0;
+    margin: 0;
+    border: none;
+    z-index: 100000;
+}
+
+.caosdb-v-tour-toc-detour {
+    font-size: 0.875em;
+    padding-left: 1em;
+}
+
+.caosdb-v-tour-toc-cur {
+    border: 1px dashed #e1eff0;
+}
+
+.caosdb-v-tour-toc-active-item.caosdb-v-tour-toc-cur {
+    border: none;
+}
+
+/* For elements in popovers which are not for clicking but only illustrative. */
+.caosdb-v-tour-unclickable {
+    cursor: text !important;
+}
diff --git a/src/core/css/webcaosdb.css b/src/core/css/webcaosdb.css
index 8d4fd1cfe69d64bf631c23eac033baee00873188..b76a5fe9ecc9f6d866dc159429ef7401ac3ddd5d 100644
--- a/src/core/css/webcaosdb.css
+++ b/src/core/css/webcaosdb.css
@@ -22,14 +22,29 @@
  */
 @CHARSET "UTF-8";
 
+
+main {
+}
+
 body {
-    display: flex;
-    flex-direction: column;
+    background-color: lightgrey;
+}
+
+.background {
+    background-color: white;
+    min-height: 60vh;
 }
 
-html {
-    min-height: 100vh%;
-    background-color: lightgray;
+@media screen and (min-height: 1150px) {
+    .background {
+        min-height: 80vh;
+    }
+}
+
+
+footer {
+    background-color: lightgrey;
+    width:100%;
 }
 
 .caosdb-v-server-message strong {
@@ -64,12 +79,6 @@ tbody:not(:hover) tr .caosdb-v-entity-version-hint-cur {
     color: unset;
 }
 
-#top-navbar>ul>li>a {
-    margin: 8px 0px;
-    padding: 6px 12px;
-    display: inline-block;
-}
-
 .caosdb-v-state-model-label .caosdb-v-state-label {
     margin-left: .6em; font-size: 100%;
 }
@@ -83,7 +92,6 @@ tbody:not(:hover) tr .caosdb-v-entity-version-hint-cur {
 .caosdb-v-bookmark-button:focus,
 .caosdb-v-bookmark-button:hover {
     color: #333;
-    position: relative;
     top: 3px;
 }
 
@@ -123,20 +131,12 @@ tbody:not(:hover) tr .caosdb-v-entity-version-hint-cur {
     text-align: center;
 }
 
-button.caosdb-v-entity-version-button {
-    height: 15px;
-}
-
 .caosdb-v-entity-header-buttons-list > * {
-    margin: 0;
-    margin-left: 8px;
     padding: 0;
-    vertical-align: middle;
 }
 
-.caosdb-v-main-col {
-    flex-grow: 1;
-    max-width: 90vw;
+.caosdb-v-entity-property-attributes {
+    font-size: 0.75em;
 }
 
 .caosdb-v-show-only-child {
@@ -159,7 +159,8 @@ button.caosdb-v-entity-version-button {
 /* DEPRECATED css class .caosdb-property-text-value - Use
 * .caosdb-f-property-single-raw-value or introduce new
 * .caosdb-v-property-text-value */
-.caosdb-property-text-value {
+.caosdb-property-text-value,
+.caosdb-v-property-text-value {
     white-space: pre-line;
 }
 
@@ -183,24 +184,12 @@ button.caosdb-v-entity-version-button {
     font-size: 16px;
 }
 
-.caosdb-f-main {
-    display: flex;
-    width: unset;
-    min-height: 65vh;
-}
-.caosdb-f-main-entities {
-    width: calc(100% - 5px);
-    min-width: 50vw;
-}
-
 .caosdb-show-preview-button, .caosdb-hide-preview-button {
     position: absolute;
-    top: 2px;
-    left: -8px;
-}
-
-.caosdb-entity-heading-attr {
-    overflow-x: auto;
+    left: -0.65rem;
+    padding-left: 0;
+    padding-right: 0;
+    background-color: transparent !important;
 }
 
 a.label.caosdb-id-button:hover {
@@ -211,8 +200,12 @@ h5 {
     margin: auto;
 }
 
-.caosdb-properties-heading {
-    display: none;
+.caosdb-f-main-entities {
+    max-width: 100%;
+}
+
+.caosdb-f-main-entities-edit {
+    max-width: calc(100% - 240px);
 }
 
 .caosdb-entity-preview .caosdb-entity-panel-body {
@@ -230,31 +223,42 @@ h5 {
 .caosdb-preview-carousel-nav {
     position: relative;
 }
+
+.caosdb-query-form {
+    width: 100%;
+}
+
 .caosdb-query-panel {
-	padding-top: 20px;
-	padding-bottom: 20px;
+    padding-top: 20px;
+    padding-bottom: 20px;
 }
 
-.navbar-default .btn-link:hover {
+.navbar-light .btn-link:hover {
 	text-decoration: none;
 }
 
-.navbar-default .btn-link:focus {
+.navbar-light .btn-link:focus {
     text-decoration: none;
 }
 
-.navbar-fixed-top, .navbar-fixed-bottom {
-    position: sticky;
+.caosdb-v-property-left-col {
+    min-height: 30px;
+    display: inline-block;
+}
+
+.caosdb-v-property-left-col > * {
+    margin-top: 3px;
+    margin-bottom: 3px;
+    display: inline-block;
 }
 
 .caosdb-property-name {
-	font-weight: bold;
-	margin-left: 8px;
+    font-weight: bold;
 }
 
 .caosdb-square {
-	position: relative;
-	overflow: hidden;
+    position: relative;
+    overflow: hidden;
 }
 
 .caosdb-entity-actions-panel {
@@ -275,14 +279,9 @@ h5 {
 	left: 0px;
 }
 
-.caosdb-parent-name {
-    margin: 0 0.4em;
-    font-size: 14px;
-    color: black;
-}
-
 .caosdb-label-name {
     font-weight: bold;
+    text-decoration: none;
 }
 
 /* lists of values */
@@ -296,7 +295,7 @@ h5 {
 }
 .caosdb-value-list > .btn-group,
 .caosdb-value-list > ol {
-	display: inline-block;
+    display: inline-block;
     float: none;
     white-space: nowrap;
     margin-bottom: 0px;
@@ -304,32 +303,37 @@ h5 {
 }
 
 .caosdb-value-list > .list-inline > li {
-    border-left-width: 0px; 
+    background-color: white;
+    padding: 0.2rem 0.5rem;
+    margin: auto 0;
+    border: 1px solid #212529;
+    border-left-width: 0px;
+    font-size: 0.875rem;
 }
 
 .caosdb-value-list > .list-inline > li:first-child {
-	border-radius: 4px 0px 0px 4px;
-	border-left-width: 1px;
+    border-radius: 0.2rem 0px 0px 0.2rem;
+    border-left-width: 1px;
 }
 
 .caosdb-value-list > .list-inline > li:last-child {
-    border-radius: 0px 4px 4px 0px;
+    border-radius: 0px 0.2rem 0.2rem 0px;
 }
 
 /* single boolean values */
 .caosdb-boolean-true {
-	font-weight: bold;
-	font-size: 90%;
-	border: 1px solid #bbb;
-	padding: 2px 8px;
-	border-radius: 8px;
+    font-weight: bold;
+    font-size: 90%;
+    border: 1px solid #bbb;
+    padding: 0 5px;
+    border-radius: 8px;
 }
 
 .caosdb-boolean-false {
     font-weight: bold;
     font-size: 90%;
     border: 1px solid #bbb;
-    padding: 2px 8px;
+    padding: 0 5px;
     border-radius: 8px;
 }
 
@@ -338,16 +342,14 @@ h5 {
     border-bottom-right-radius: 3px;  
 }
 
-.caosdb-entity-panel-body {
-    padding: 0px 10px;
-}
-
-.caosdb-entity-panel-body > :first-child {
-	margin-top: 15px;
+.coasdb-entity-version-attr,
+.caosdb-entity-heading-attr {
+    overflow-x: auto;
 }
 
+.coasdb-entity-version-attr-name,
 .caosdb-entity-heading-attr-name {
-	color: #6c6c6c;
+    color: #6c6c6c;
     font-size: 90%;
     margin-right: 0.3em; 
 }
@@ -377,25 +379,11 @@ h5 {
     padding: 5px;
 }
 
-.caosdb-v-edit-list {
-    padding-left: 0px;
-}
-
-.caosdb-v-editmode-existing {
-    height: 320.7px;
+.caosdb-v-editmode-existing ul {
+    height: 280.0px;
     overflow-y: auto;
 }
 
-.caosdb-v-edit-panel {
-    position: sticky;
-    top: 57px;
-    padding: 0px;
-    margin-top: 5px;
-    margin-left: 5px;
-    width: unset;
-    height: 800px;
-}
-
 .caosdb-v-editmode-btngroup {
     padding-bottom: 15px;
 }
@@ -426,33 +414,22 @@ h5 {
 
 .caosdb-label-record {
     background-color: #F92108;
-    margin: -4px 0.2em 0 0.4em;
+    border: 1px solid #F92108;
 }
 
 .caosdb-label-recordtype {
     background-color: #00A32E;
-    margin-right: 8px;
+    border: 1px solid #00A32E;
 }
 
 .caosdb-label-property {
     background-color: #496DAB;
-    margin-right: 8px;
+    border: 1px solid #496DAB;
 }
 
 .caosdb-label-file {
     background-color: #C92E86;
-    margin-right: 8px;
-}
-
-.label.caosdb-id-button {
-    background-color: #4E5752;
-}
-
-.caosdb-properties-heading {
-    padding-top: 2px;
-    padding-bottom: 2px;
-    background-color: #f5f5f5;
-    color: #7c7c7c;
+    border: 1px solid #C92E86;
 }
 
 .caosdb-parents-heading {
@@ -471,13 +448,13 @@ h5 {
 
 .caosdb-parent-item {
     border: 1px solid #666;
-    border-radius: 1ex;
-    padding: .3ex .2em .3ex;
-    margin: 0 0.5em;
+    color: black;
+    text-decoration: none;
 }
 
-.caosdb-f-parent-list {
-    margin: 0 0.5em 0 auto;
+.caosdb-parent-item a {
+    color: black;
+    text-decoration: none;
 }
 
 .caosdb-unit {
@@ -486,44 +463,10 @@ h5 {
     margin-left: 0.3em;
 }
 
-.navbar-brand {
-    display: flex;
-    align-items: center;
-}
-
-.navbar-brand>img {
-    padding: 0px 0px;
-    height: 100%
-}
-
 .caosdb-fs-cwd::before {
     content: " > ";
 }
 
-.caosdb-fs-dir>.glyphicon::before {
-    content: "\e117";
-}
-
-.caosdb-fs-dir>.glyphicon {
-    margin-right: 8px;
-}
-
-.caosdb-fs-dir:hover>.glyphicon::before {
-    content: "\e118";
-}
-
-.caosdb-fs-file>.glyphicon::before {
-    content: "\e022";
-}
-
-.caosdb-fs-file>.glyphicon {
-    margin-right: 8px;
-}
-
-.caosdb-fs-file:hover>.glyphicon::before {
-    content: "\e025";
-}
-
 .caosdb-fs-btn-file {
     padding: 0px;
     background-color: transparent;
@@ -548,7 +491,10 @@ h5 {
 }
 
 .caosdb-logo {
+    margin-top: auto;
+    margin-bottom: auto;
     margin-right: 8px;
+    max-height: 30px;
 }
 
 .caosdb-comment-action-item {
@@ -561,36 +507,6 @@ h5 {
     border-left: 0px solid #7c7c7c;
 }
 
-.caosdb-paging-panel {
-    padding-left: 0px;
-    padding-right: 0px;
-}
-
-.caosdb-pagination {
-    margin: 5px 15px;
-}
-
-.caosdb-pagination-navbar {
-    padding-bottom: 5px;
-    position: fixed;
-    bottom: 0px;
-    width: 100%;
-    border: 0px;
-    border-top: 1px solid #e7e7e7;
-    z-index: 1000;
-    position: fixed;
-}
-
-.caosdb-heading {
-    color: #5e5e5e;
-    background-color: #f8f8f8;
-    border-bottom: 1px solid #e7e7e7;
-}
-
-.caosdb-heading>.container {
-    padding: 20px 0px;
-}
-
 .spinning {
     animation: spin 2s linear infinite;
 }
@@ -602,7 +518,14 @@ h5 {
 
 .caosdb-v-property-row {
     animation: appear 0.5s 1;
-    padding: 0.3ex 1em;
+    padding-left: 2.4rem;
+    padding-right: 1rem;
+    padding-top: 0.3ex;
+    padding-bottom: 0.3ex;
+    border-radius: none;
+    border-left: none;
+    border-right: none;
+
 }
 
 @keyframes appear {
@@ -649,8 +572,10 @@ input[type="file"] {
     text-align: center;
     color: #69c2df;
     border: 2px dashed #69c2df;
-    padding: 25px 0px;
-    margin: 25px 0px;
+    padding: 25px 0;
+    margin: 1rem;
+    margin-top: 20px;
+    margin-bottom: 0px;
 }
 
 .caosdb-v-edit-mode-property-dropzone:hover {
@@ -700,25 +625,27 @@ input[type="file"] {
 }
 
 .caosdb-v-property-other-inputs {
-    margin-top: 10px;
-    margin-bottom: 10px;
+    margin-top: 6px;
+    margin-bottom: 6px;
 }
 
-footer {
-    background-color: lightgrey;
-    padding: 0.5em;
+.caosdb-bulletsep {
+    margin-left: 2ch;
+    margin-right: 2ch;
 }
 
-.caosdb-footer-element {
-    margin: 1em;
+details summary .dropdown {
+    display:none;
+}
+details[open] summary .dropdown {
+    display:block;
 }
 
-.caosdb-bulletsep {
-    margin-left: 2ch;
-    margin-right: 2ch;
+.modal-dialog {
+  top:80px;
 }
 
-details summary { 
+details summary {
     cursor: pointer;
     display: list-item;
 }
@@ -726,3 +653,121 @@ details summary {
 details summary > * {
     display: inline;
 }
+
+details p {
+    margin-bottom: 0.2rem;
+}
+
+.caosdb-v-tour-overview-entry-page a {
+  text-decoration: none;
+  padding: .1875rem .5rem;
+  margin-top: .125rem;
+  margin-left: 1.25rem;
+}
+
+.caosdb-next-button,
+.caosdb-prev-button {
+    visibility: hidden;
+}
+
+.caosdb-next-button[href],
+.caosdb-prev-button[href] {
+    visibility: visible;
+}
+
+.caosdb-f-paging-panel {
+    display: none;
+    height: 31px;
+}
+
+.caosdb-f-show-paging-panel .caosdb-f-paging-panel {
+    display: flex;
+    justify-content: space-between;
+}
+
+.caosdb-properties {
+    margin-left: -1rem;
+    margin-right: -1rem;
+}
+
+.caosdb-v-state-label {
+    background-color: #333;
+}
+
+.caosdb-v-state-model-label {
+    background-color: #666;
+    padding-top: 0;
+    padding-bottom: 0;
+    padding-right: 0;
+    font-size: inherit;
+}
+
+.caosdb-v-tour-popover-close-button {
+    padding: 0;
+    position: absolute;
+    top: 0.6rem;
+    right: 0.6rem;
+    font-size: 1rem;
+}
+
+.caosdb-f-property-value {
+    position: relative;
+    margin-top: auto;
+    margin-bottom: auto;
+}
+
+.caosdb-f-reference-value {
+    background-color: white;
+    padding: 0.2rem 0.5rem;
+}
+
+.caosdb-f-edit {
+    display: none;
+    position: relative;
+    width: 240px;
+    flex-shrink: 0;
+}
+
+.caosdb-v-edit-panel {
+    padding: 0px;
+    height: min-content;
+    position: fixed;
+    width: 240px;
+}
+
+.caosdb-f-show-paging-panel .caosdb-v-edit-panel {
+    margin-top: 39px;
+}
+
+.caosdb-query-response.card .card-header {
+    border: none;
+}
+
+.caosdb-f-entity-state-transition-button:hover {
+    filter: brightness(110%);
+}
+
+.caosdb-f-entity-state-transition-button {
+    border: none;
+}
+
+.caosdb-f-map-panel .leaflet-container {
+    height: 500px;
+}
+
+.caosdb-v-field .bootstrap-select button {
+    border: 1px solid #ced4da;
+    background-color: #FFF;
+}
+
+.caosdb-v-field > div {
+    margin-top: auto;
+    margin-bottom: auto;
+}
+
+.caosdb-v-property-href-value {
+    text-decoration: none;
+    font-weight: 600;
+    font-size: 0.875rem;
+    color: #5E6762;
+}
diff --git a/src/core/css/webcaosdb.less b/src/core/css/webcaosdb.less
deleted file mode 100644
index 5ecb7fdf28a4cf3e5f93c78863faaef40e34e385..0000000000000000000000000000000000000000
--- a/src/core/css/webcaosdb.less
+++ /dev/null
@@ -1,401 +0,0 @@
-/*
- * ** header v3.0
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2018 Research Group Biomedical Physics,
- * Max-Planck-Institute for Dynamics and Self-Organization Göttingen
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * ** end header
- */
-
-@radius_normal: 4px;
-@margin_normal: 8px;
-@border1: 1px solid #e7e7e7;
-
-.caosdb-v-show-only-child {
-    display: none;
-}
-
-.caosdb-v-show-only-child:only-child {
-    display: initial;
-}
-
-.caosdb-comment-annotation-text h1 {
-    font-size: 24px;
-}
-
-.caosdb-comment-annotation-text h2 {
-    font-size: 20px;
-}
-
-.caosdb-comment-annotation-text h3 {
-    font-size: 18px;
-}
-
-.caosdb-comment-annotation-text h4 {
-    font-size: 16px;
-}
-
-.caosdb-show-preview-button, .caosdb-hide-preview-button {
-    position: absolute;
-    top: 5px;
-    left: -5px;
-}
-
-.caosdb-entity-heading-attr {
-    overflow-x: auto;
-}
-
-a.label.caosdb-id-button:hover {
-    background-color: #5E6762;
-}
-
-.caosdb-entity-preview .caosdb-entity-panel-body {
-    overflow-y: auto;
-    max-height: 250px;
-}
-
-.caosdb-preview-carousel-nav > .caosdb-value-list > .btn-group > .btn:first-child {
-    margin-left: 34px;
-}
-.caosdb-preview-carousel-nav > .caosdb-value-list > .btn-group > .btn:last-child {
-    margin-right: 34px;
-}
-
-.caosdb-preview-carousel-nav {
-    position: relative;
-}
-.caosdb-query-panel {
-	padding-top: 20px;
-	padding-bottom: 20px;
-}
-
-.navbar-default .btn-link:hover {
-	text-decoration: none;
-}
-
-.navbar-default .btn-link:focus {
-    text-decoration: none;
-}
-
-.caosdb-property-name {
-	font-weight: bold;
-	margin-left: @margin-normal;
-}
-
-.caosdb-square {
-	position: relative;
-	overflow: hidden;
-}
-
-.caosdb-square::before {
-	content: "";
-	display: block;
-	padding-top: 100%;
-}
-
-.caosdb-square-content {
-	position: absolute;
-	top: 0px;
-	right: 0px;
-	bottom: 0px;
-	left: 0px;
-}
-
-.caosdb-parent-name {
-    font-weight: bold;
-    margin-right: 4px;	
-}
-
-/* lists of values */
-/* INLINE (with default scroll-bar) */
-.caosdb-value-list {	
-	overflow-x: auto;
-}
-
-.caosdb-value-list > .btn-group > .btn {
-    float: none;
-}
-.caosdb-value-list > .btn-group,
-.caosdb-value-list > ol {
-	display: inline-block;
-    float: none;
-    white-space: nowrap;
-    margin-bottom: 0px;
-    margin-left: 0px;
-}
-
-.caosdb-value-list > .list-inline > li {
-    border-left-width: 0px; 
-}
-
-.caosdb-value-list > .list-inline > li:first-child {
-	border-radius: @radius_normal 0px 0px @radius_normal;
-	border-left-width: 1px;
-}
-
-.caosdb-value-list > .list-inline > li:last-child {
-    border-radius: 0px @radius_normal @radius_normal 0px;
-}
-
-/* single boolean values */
-.caosdb-boolean-true {
-	font-weight: bold;
-	font-size: 90%;
-	border: 1px solid #bbb;
-	padding: 2px 8px;
-	border-radius: 8px;
-}
-
-.caosdb-boolean-false {
-    .caosdb-boolean-true();
-}
-
-.caosdb-entity-panel-heading {
-    border-bottom-left-radius: 3px;
-    border-bottom-right-radius: 3px;  
-}
-
-.caosdb-entity-panel-body {
-    padding: 0px 15px;	
-}
-
-.caosdb-entity-panel-body > :first-child {
-	margin-top: 15px;
-}
-
-.caosdb-entity-heading-attr-name {
-	color: #6c6c6c;
-    font-size: 90%;
-    margin-right: 0.3em; 
-}
-
-.caosdb-subproperty-divider {
-    margin: 4px 0px;
-    border-top: 1px solid #dddddd
-}
-
-.caosdb-prop-label {
-    background-color: #f5f5f5;
-    font-weight: bold;
-    padding: 8px 15px;
-}
-
-.caosdb-prop-value {
-    background-color: #ffffff;
-    padding: 8px 15px;
-}
-
-.caosdb-prop-list-group .row {
-    margin-left: 0px;
-    margin-right: 0px;
-}
-
-.caosdb-prop-list-group>.list-group-item {
-    padding: 0px
-}
-
-.caosdb-prop-list-group>.list-group-item:first-child .caosdb-prop-label
-    {
-    border-top-left-radius: @radius_normal;
-    border-top-right-radius: @radius_normal;
-}
-
-.caosdb-prop-list-group>.list-group-item:first-child .caosdb-prop-value
-    {
-    border-top-right-radius: @radius_normal;
-}
-
-.caosdb-prop-list-group>.list-group-item:last-child .caosdb-prop-label {
-    border-bottom-left-radius: @radius_normal;
-}
-
-.caosdb-prop-list-group>.list-group-item:last-child .caosdb-prop-value {
-    border-bottom-left-radius: @radius_normal;
-    border-bottom-right-radius: @radius_normal;
-}
-
-.caosdb-label-record {
-    background-color: #F92108;
-    margin-right: @margin-normal;
-}
-
-.caosdb-label-recordtype {
-    background-color: #00A32E;
-    margin-right: @margin-normal;
-}
-
-.caosdb-label-property {
-    background-color: #496DAB;
-    margin-right: @margin-normal;
-}
-
-.caosdb-label-file {
-    background-color: #C92E86;
-    margin-right: @margin-normal;
-}
-
-.label.caosdb-id-button {
-    background-color: #4E5752;
-}
-
-
-.caosdb-properties-heading {
-    padding-top: 2px;
-    padding-bottom: 2px;
-    background-color: #f5f5f5;
-    color: #7c7c7c
-}
-
-.caosdb-parents-heading {
-    .caosdb-properties-heading();
-}
-
-.caosdb-comments-heading {
-    .caosdb-properties-heading();
-}
-
-.caosdb-parent-item {
-    padding-left: 40px;
-    text-indent: -40px
-}
-
-.caosdb-unit {
-    color: #8c8c8c;
-    font-size: 80%;
-    margin-left: 0.3em;
-}
-
-.navbar-brand {
-    display: flex;
-    align-items: center;
-}
-
-.navbar-brand>img {
-    padding: 0px 0px;
-    height: 100%
-}
-
-.caosdb-fs-cwd::before {
-    content: " > ";
-}
-
-.caosdb-fs-dir>.glyphicon::before {
-    content: "\e117";
-}
-
-.caosdb-fs-dir>.glyphicon {
-    margin-right: @margin-normal;
-}
-
-.caosdb-fs-dir:hover>.glyphicon::before {
-    content: "\e118";
-}
-
-.caosdb-fs-file>.glyphicon::before {
-    content: "\e022";
-}
-
-.caosdb-fs-file>.glyphicon {
-    margin-right: @margin-normal;
-}
-
-.caosdb-fs-file:hover>.glyphicon::before {
-    content: "\e025";
-}
-
-.caosdb-fs-btn-file {
-    padding: 0px;
-    background-color: transparent;
-    border: 0px;
-}
-
-.caosdb-fs-btn-file:hover .caosdb-label-file {
-    background-color: #F96EB6;
-}
-
-.caosdb-fs-btn-file:hover .caosdb-label-id {
-    background-color: #6E8782;
-}
-
-.back-to-top {
-    cursor: pointer;
-    position: fixed;
-    bottom: 10px;
-    right: 15px;
-    display: none;
-    z-index: 1050;
-}
-
-.caosdb-logo {
-    margin-right: @margin-normal;
-}
-
-.caosdb-comment-action-item {
-    padding-left: 4px;
-    padding-right: 4px;
-    border-left: 1px solid #7c7c7c;
-}
-
-.caosdb-comment-action>.caosdb-comment-action-item:first-child {
-    border-left: 0px solid #7c7c7c;
-}
-
-.caosdb-pagination {
-    margin: 5px 15px;
-}
-
-.caosdb-pagination-navbar {
-    padding-bottom: 5px;
-    position: fixed;
-    bottom: 0px;
-    width: 100%;
-    border: 0px;
-    border-top: @border1;
-    z-index: 1000;
-    position: fixed;
-}
-
-.caosdb-heading {
-    color: #5e5e5e;
-    background-color: #f8f8f8;
-    border-bottom: @border1;
-}
-
-.caosdb-heading>.container {
-    padding: 20px 0px;
-}
-
-.spinning {
-    animation: spin 2s linear infinite;
-}
-
-@keyframes spin {
-    0% { transform: rotate(0deg); }
-    100% { transform: rotate(360deg); }
-}
-
-.flipped-horiz-icon {
-    transform: scaleX(-1);
-}
-
-.spacer {
-    margin-left: 12px;
-}
-
-input[type="file"] {
-    display: none;
-}
diff --git a/src/core/js/annotation.js b/src/core/js/annotation.js
index 685930da76d73980985210484a60f51690e45a46..42b4217cf2a7c2cd1214d0384ba09a23e2cddaf3 100644
--- a/src/core/js/annotation.js
+++ b/src/core/js/annotation.js
@@ -36,12 +36,12 @@ this.annotation = new function() {
     this.createNewCommentForm = function(entityId) {
         var form = $('<form class="caosdb-new-comment-form">' +
             '<input type="hidden" name="annotationOf" value="' + entityId + '"> ' +
-            '<div class="form-group">' +
+            '<div class="form-control">' +
             '<label for="comment">Your new comment:</label>' +
             '<textarea class="form-control" rows="5" name="newComment" title="Your comment with 5 or more characters." pattern=".{5,}"></textarea>' +
             '</div>' +
-            '<button class="btn btn-default" title="Submit this comment." type="submit" name="submit" value="Submit">Submit</button>' +
-            '<button class="btn btn-default" title="Cancel this comment." type="reset" name="cancel" value="Cancel">Cancel</button>' +
+            '<button class="btn btn-secondary" title="Submit this comment." type="submit" name="submit" value="Submit">Submit</button>' +
+            '<button class="btn btn-secondary" title="Cancel this comment." type="reset" name="cancel" value="Cancel">Cancel</button>' +
             '</form>');
         return form[0];
     }
@@ -117,7 +117,7 @@ this.annotation = new function() {
 
     this.createError = function(error) {
         var ret = $('<div class="alert alert-danger caosdb-new-comment-error alert-dismissable">' +
-            '<button class="close" data-dismiss="alert" aria-label="close">×</button>' +
+            '<button class="btn-close" data-bs-dismiss="alert" aria-label="close"></button>' +
             '<strong>' + error.name + '!</strong> ' + error.message + '<p class="small"><pre><code>' +
             (error.stack ? error.stack : "") + '</code></pre></p></div>')[0];
         return ret;
@@ -390,9 +390,15 @@ this.annotation = new function() {
     }
 
     this.loadComments = async function(annotationSection) {
-        var entityId = annotation.getEntityId(annotationSection);
-        var annotations = await annotation.getAnnotationsForEntity(entityId, annotation.queryAnnotation, annotation.loadAnnotationXsl(connection.getBasePath()));
+        const entityId = annotation.getEntityId(annotationSection);
+        const annotations = await annotation.getAnnotationsForEntity(entityId, annotation.queryAnnotation, annotation.loadAnnotationXsl(connection.getBasePath()));
+        const len = annotations.length;
         $(annotationSection).append(annotations);
+        if (len > 0) {
+            const button = $(`#${entityId} .caosdb-v-entity-header-buttons-list .caosdb-v-entity-comment-badge`);
+            button.empty();
+            button.append(`<span class="badge bg-dark caosdb-v-entity-number-of-comments">${len}<i class="bi-chat-left-fill ms-1"></i></span>`);
+        }
     }
 
     /**
@@ -427,4 +433,8 @@ this.annotation = new function() {
     }
 };
 
-$(document).ready(annotation.init);
+$(document).ready(function() {
+    if ("${BUILD_MODULE_EXT_ANNOTATION}" == "ENABLED") {
+        caosdb_modules.register(annotation);
+    }
+});
diff --git a/src/core/js/caosdb.js b/src/core/js/caosdb.js
index cb10201556af4eca6fd3105397eda1a3f5552c0b..90d6bfd23b989bbff133a63d65e1e68d99f4b3bb 100644
--- a/src/core/js/caosdb.js
+++ b/src/core/js/caosdb.js
@@ -632,7 +632,7 @@ function getPropertyFromElement(propertyelement, names = undefined) {
                 }
             } else {
                 // list of anything but references
-                listel = findElementByConditions(valel, x => x.classList.contains("list-group-item"),
+                listel = findElementByConditions(valel, x => x.classList.contains("list-inline-item"),
                     x => x.classList.contains("caosdb-preview-container"));
                 for (var j = 0; j < listel.length; j++) {
                     property.value.push(listel[j].textContent);
@@ -805,7 +805,7 @@ function setPropertySafe(valueelement, property, propold) {
             } else {
                 finalstring = '';
                 for (var i = 0; i < property.value.length; i++) {
-                    finalstring += '<a class="btn btn-default btn-sm caosdb-resolvable-reference" href="' + serverstring + property.value[i] + '"><span class="caosdb-id">' + property.value[i] + '</span><span class="caosdb-resolve-reference-target" /></a>';
+                    finalstring += '<a class="btn btn-secondary btn-sm caosdb-resolvable-reference" href="' + serverstring + property.value[i] + '"><span class="caosdb-id">' + property.value[i] + '</span><span class="caosdb-resolve-reference-target" /></a>';
                 }
             }
             valueelement.getElementsByClassName("caosdb-value-list")[0].getElementsByClassName("caosdb-overflow-content")[0].innerHTML = finalstring;
@@ -819,15 +819,12 @@ function setPropertySafe(valueelement, property, propold) {
             ael.setAttribute("href", serverstring + property.value);
             ael.innerHTML = '<span class="caosdb-id">' + property.value + '</span><span class="caosdb-resolve-reference-target" />';
         } else {
-            finalstring = '<a class="btn btn-default btn-sm caosdb-resolvable-reference" href="' + serverstring + property.value + '"><span class="caosdb-id">' + property.value + '</span><span class="caosdb-resolve-reference-target" /></a>';
+            finalstring = '<a class="btn btn-secondary btn-sm caosdb-resolvable-reference" href="' + serverstring + property.value + '"><span class="caosdb-id">' + property.value + '</span><span class="caosdb-resolve-reference-target" /></a>';
             valueelement.innerHTML = finalstring;
             preview.init();
         }
     } else {
-        /* DEPRECATED css class .caosdb-property-text-value - Use
-         * .caosdb-f-property-single-raw-value or introduce new
-         * .caosdb-v-property-text-value */
-        valueelement.innerHTML = "<span class='caosdb-property-text-value'>" + property.value + "</span>";
+        valueelement.innerHTML = "<span class='caosdb-f-property-single-raw-value caosdb-f-property-text-value caosdb-v-property-text-value'>" + property.value + "</span>";
     }
 }
 
@@ -1158,22 +1155,6 @@ async function retrieve_dragged_property(id) {
     return transformation.transformProperty(entities);
 }
 
-/**
- * Retrieve all properties and record types and convert them into
- * a web page using a specialized XSLT named entity palette.
- * @return An array of entities.
- */
-async function retrieve_data_model() {
-    // TODO possibly allow single query
-    let props = await connection.get("Entity/?query=FIND Property");
-    let rts = await connection.get("Entity/?query=FIND RecordType");
-    for (var p of props.children[0].children) {
-        rts.children[0].appendChild(p.cloneNode());
-    }
-    return transformation.transformEntityPalette(rts);
-}
-
-
 /**
  * Update an entity using its xml representation.
  * @param xml The xml of the entity which will be automatically wrapped with an Update.
diff --git a/src/core/js/edit_mode.js b/src/core/js/edit_mode.js
index aad96fca3e2d391352c582167975d163f6d1c2ac..85645aabaf7d05cb7abe928b4792b5de6ef9e352 100644
--- a/src/core/js/edit_mode.js
+++ b/src/core/js/edit_mode.js
@@ -5,6 +5,8 @@
  * Copyright (C) 2018 Research Group Biomedical Physics,
  * Max-Planck-Institute for Dynamics and Self-Organization Göttingen
  * Copyright (C) 2019 Henrik tom Wörden
+ * Copyright (C) 2019-2021 IndiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2019-2021 Timm Fitschen <t.fitschen@indiscale.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -27,7 +29,7 @@
 /**
  * Edit mode module
  */
-var edit_mode = new function() {
+var edit_mode = new function () {
 
     var logger = log.getLogger("edit_mode");
 
@@ -63,30 +65,41 @@ var edit_mode = new function() {
      */
     this.property_data_type_changed = new Event("caosdb.edit_mode.property_data_type_changed");
 
-    this.init = function() {
+    /**
+     * Initialize this module
+     */
+    this.init = function () {
         if (isAuthenticated()) {
-            var target = $("#top-navbar").find("ul").first();
-            this.add_edit_mode_button(target, edit_mode.toggle_edit_mode);
-            if (this.is_edit_mode()) {
-                edit_mode.enter_edit_mode();
-                edit_mode.toggle_edit_panel();
-            }
-            $('.caosdb-f-edit').css("transition", "top 1s");
+            this._init();
         } else {
             window.localStorage.removeItem("edit_mode");
         }
     }
 
+    this._init = function () {
+        var target = $("#top-navbar").find("ul").first();
+        this.add_edit_mode_button(target, edit_mode.toggle_edit_mode);
+        if (this.is_edit_mode()) {
+            edit_mode.enter_edit_mode();
+            edit_mode.toggle_edit_panel();
+            // This is for the very specific case of reloading the
+            // page while the edit mode is active on small screens
+            $(".caosdb-edit-min-width-warning").removeClass("d-none");
+            $(".caosdb-edit-min-width-warning").addClass("d-block");
+        }
+        $('.caosdb-f-edit').css("transition", "top 1s");
+    }
+
 
-    this.dragstart = function(e) {
+    this.dragstart = function (e) {
         e.dataTransfer.setData("text/plain", e.target.id);
     }
 
-    this.dragleave = function(e) {
+    this.dragleave = function (e) {
         edit_mode.unhighlight();
     }
 
-    this.dragover = function(e) {
+    this.dragover = function (e) {
         e.preventDefault();
         e.dataTransfer.dropEffect = "copy";
         edit_mode.highlight(this);
@@ -99,7 +112,7 @@ var edit_mode = new function() {
      * @param new_prop
      * @param make_property_editable_cb
      */
-    this.add_new_property = function(entity, new_prop, make_property_editable_cb = edit_mode.make_property_editable) {
+    this.add_new_property = function (entity, new_prop, make_property_editable_cb = edit_mode.make_property_editable) {
         if (typeof entity === "undefined" || !(entity instanceof HTMLElement)) {
             throw new TypeError("entity must instantiate HTMLElement");
         }
@@ -119,7 +132,7 @@ var edit_mode = new function() {
      * @param {Event} e - the drop event.
      * @param {HTMLElement} entity - the entity.
      */
-    this.add_dropped_property = function(e, entity) {
+    this.add_dropped_property = function (e, entity) {
         var propsrcid = e.dataTransfer.getData("text/plain");
         var tmp_id = propsrcid.split("-");
         var prop_id = tmp_id[tmp_id.length - 1];
@@ -144,7 +157,7 @@ var edit_mode = new function() {
      * @param {Event} e - the drop event.
      * @param {HTMLElement} entity - the entity.
      */
-    this.add_dropped_parent = function(e, entity) {
+    this.add_dropped_parent = function (e, entity) {
         var propsrcid = e.dataTransfer.getData("text/plain");
         var parent_list = entity.getElementsByClassName("caosdb-f-parent-list")[0]
         var tmp_id = propsrcid.split("-");
@@ -157,34 +170,28 @@ var edit_mode = new function() {
             var dragged_rt = str2xml('<Response><RecordType id="' + prop_id + '" name="' + name + '"></RecordType></Response>');
             transformation.transformParent(dragged_rt).then(new_prop => {
                 parent_list.appendChild(new_prop);
-                /*
-                edit_mode.add_one_delete_button(
-                    parent_list.children[parent_list.children.length-1],
-                    is_parent=true
-                );
-                */
                 edit_mode.add_parent_delete_buttons(entity);
             }, edit_mode.handle_error);
 
         }
     }
 
-    this.property_drop_listener = function(e) {
+    this.property_drop_listener = function (e) {
         edit_mode._drop_listener.call(this, e, edit_mode.add_dropped_property);
     }
 
-    this.parent_drop_listener = function(e) {
+    this.parent_drop_listener = function (e) {
         edit_mode._drop_listener.call(this, e, edit_mode.add_dropped_parent);
     }
 
-    this._drop_listener = function(e, add_cb) {
+    this._drop_listener = function (e, add_cb) {
         e.preventDefault();
         edit_mode.unhighlight();
 
         const app = edit_mode.app;
         const state = app.state;
 
-        if(state === "initial"){
+        if (state === "initial") {
             var entity = $(this).parent();
             app.startEdit(entity[0]);
         } else if (state !== "changed") {
@@ -197,7 +204,7 @@ var edit_mode = new function() {
 
     // Dropping a RecordType in the heading will add it as a parent.
     // This is done by this function. 
-    this.parent_drop = function(e) {
+    this.parent_drop = function (e) {
         logger.assert(edit_mode.app.state === "changed", "state should be changed. Current state: ", edit_mode.app.state, edit_mode.app, e);
         e.preventDefault();
         edit_mode.unhighlight();
@@ -205,7 +212,7 @@ var edit_mode = new function() {
     }
 
 
-    this.set_entity_dropable = function(entity, dragover, dragleave, parent_drop, property_drop) {
+    this.set_entity_dropable = function (entity, dragover, dragleave, parent_drop, property_drop) {
         if (getEntityRole(entity) === "Property") {
             // currently no parents and subproperties for properties.
             return;
@@ -225,7 +232,7 @@ var edit_mode = new function() {
 
     }
 
-    this.unset_entity_dropable = function(entity, dragover, dragleave, parent_drop, property_drop) {
+    this.unset_entity_dropable = function (entity, dragover, dragleave, parent_drop, property_drop) {
         var rts = entity.getElementsByClassName("caosdb-entity-panel-body");
         for (var rel of rts) {
             rel.removeEventListener("dragleave", dragleave);
@@ -240,11 +247,11 @@ var edit_mode = new function() {
         }
     }
 
-    this.remove_save_button = function(ent) {
+    this.remove_save_button = function (ent) {
         $(ent).find('.caosdb-f-entity-save-button').remove();
     }
 
-    this.add_save_button = function(ent, callback) {
+    this.add_save_button = function (ent, callback) {
         var save_btn = $('<button class="btn btn-link caosdb-update-entity-button caosdb-f-entity-save-button">Save</button>');
 
         $(ent).find(".caosdb-f-edit-mode-entity-actions-panel").append(save_btn);
@@ -279,7 +286,7 @@ var edit_mode = new function() {
      * last trash button for the last parent if the header belongs to a
      * record).
      */
-    this.add_parent_delete_buttons = function(header) {
+    this.add_parent_delete_buttons = function (header) {
         $(header).find(".caosdb-f-parent-trash-button").remove();
         var parents = $(header).find(".caosdb-parent-item");
         if ((parents.length > 1) || getEntityRole(header) != "Record") {
@@ -295,7 +302,7 @@ var edit_mode = new function() {
      * Append a trash button with class "caosdb-f-parent-trash-button", bind a
      * remove on the deletable, and bind a callback function to click.
      */
-    this.add_parent_trash_button = function(appendable, deletable, callback = undefined) {
+    this.add_parent_trash_button = function (appendable, deletable, callback = undefined) {
         edit_mode.add_trash_button(appendable, deletable, "caosdb-f-parent-trash-button", callback);
     }
 
@@ -303,7 +310,7 @@ var edit_mode = new function() {
      * Append a trash button with class "caosdb-f-property-trash-button" and
      * bind a remove on the deletable.
      */
-    this.add_property_trash_button = function(appendable, deletable) {
+    this.add_property_trash_button = function (appendable, deletable) {
         edit_mode.add_trash_button(appendable, deletable, "caosdb-f-property-trash-button", undefined, "Remove this property");
     }
 
@@ -319,9 +326,9 @@ var edit_mode = new function() {
      * @param {string} [title] - optional title for the button element.
      * @return {undefined}
      */
-    this.add_trash_button = function(appendable, deletable, className, callback = undefined, title = undefined) {
-        var button = $('<button class="btn btn-link ' + className + ' caosdb-f-entity-trash-button"><span class="glyphicon glyphicon-trash"></span></button>');
-        if(title) {
+    this.add_trash_button = function (appendable, deletable, className, callback = undefined, title = undefined) {
+        var button = $('<button class="btn btn-link p-0 ' + className + ' caosdb-f-entity-trash-button"><i class="bi-trash"></i></button>');
+        if (title) {
             button.attr("title", title);
         }
         $(appendable).append(button);
@@ -366,7 +373,11 @@ var edit_mode = new function() {
             atomic = "REFERENCE";
         }
 
-        return { "atomic_datatype": atomic, "reference_scope": ref, "is_list": is_list};
+        return {
+            "atomic_datatype": atomic,
+            "reference_scope": ref,
+            "is_list": is_list
+        };
     }
 
     /**
@@ -407,10 +418,10 @@ var edit_mode = new function() {
      *        of entities in HTML representation.
      * @returns {XMLDocument} the unprocessed server response.
      */
-    this.insert_entity = async function(ent_elements) {
+    this.insert_entity = async function (ent_elements) {
         ent_elements = caosdb_utils.assert_array(ent_elements, "param `ent_elements`", true);
         var xmls = [];
-        for ( const ent_element of ent_elements ) {
+        for (const ent_element of ent_elements) {
             xmls.push(edit_mode.form_to_xml(ent_element));
         }
         return await insert(xmls);
@@ -423,7 +434,7 @@ var edit_mode = new function() {
      * @returns {Document|DocumentFragment} - An xml document containing the
      *     entity in XML representation.
      */
-    this.form_to_xml = function(entity_form) {
+    this.form_to_xml = function (entity_form) {
         const obj = form_elements.form_to_object($(entity_form).find("form")[0])[0];
         var entityRole = getEntityRole(entity_form);
         var file_path = undefined;
@@ -454,11 +465,11 @@ var edit_mode = new function() {
     /**
      * TODO merge with getPropertyFromElement in caosdb.js
      */
-    this.getPropertyFromElement = function(element) {
+    this.getPropertyFromElement = function (element) {
         var editfield = $(element).find(".caosdb-f-property-value");
         var property = getPropertyFromElement(element);
 
-        var _parse_single_datetime = function(field) {
+        var _parse_single_datetime = function (field) {
             let time = $(field).find(":input[type='time']").val()
             let date = $(field).find(":input[type='date']").val();
             if (time) {
@@ -471,7 +482,7 @@ var edit_mode = new function() {
         // LISTs need to be handled here
         if (property.list == true) {
             property.value = [];
-            if (["TEXT","DOUBLE","INTEGER"].includes(property.listDatatype)) {
+            if (["TEXT", "DOUBLE", "INTEGER"].includes(property.listDatatype)) {
                 // LOOP over elements of editfield.find(":input")
                 for (var singleelement of $(editfield).find(":not(.caosdb-f-list-item-button):input:not(.caosdb-unit)")) {
                     property.value.push($(singleelement).val());
@@ -489,7 +500,7 @@ var edit_mode = new function() {
                 throw ("This property's data type is not supported by the webui. Please issue a feature request for support for `" + property.datatype + "`.");
             }
         } else {
-            if (["TEXT","DOUBLE","INTEGER"].includes(property.datatype)) {
+            if (["TEXT", "DOUBLE", "INTEGER"].includes(property.datatype)) {
                 property.value = editfield.find(":input:not(.caosdb-unit)").val();
             } else if (property.datatype == "DATETIME") {
                 property.value = _parse_single_datetime(editfield);
@@ -511,7 +522,7 @@ var edit_mode = new function() {
      *
      * ent_element : {HTMLElement} entity in view mode
      */
-    this.getProperties = function(ent_element) {
+    this.getProperties = function (ent_element) {
         const properties = [];
         if (ent_element) {
             const prop_elements = getPropertyElements(ent_element);
@@ -525,22 +536,25 @@ var edit_mode = new function() {
 
     }
 
-    this.update_entity = async function(ent_element) {
+    this.update_entity = async function (ent_element) {
         var xml = edit_mode.form_to_xml(ent_element);
         return await edit_mode.update(xml);
     }
 
     this.update = update;
 
-    this.add_edit_mode_button = function(target, toggle_function) {
-        var edit_mode_li = $('<li><button class="navbar-btn btn btn-link caosdb-f-btn-toggle-edit-mode">Edit Mode</button></li>');
+    this.add_edit_mode_button = function (target, toggle_function) {
+        var edit_mode_li = $('<li class="nav-item"><a class="nav-link caosdb-f-btn-toggle-edit-mode" role="button">Edit Mode</a></li>');
         $(target).append(edit_mode_li);
         $(".caosdb-f-btn-toggle-edit-mode").click(toggle_function);
 
+        var min_width_warning = $('<div class="alert alert-warning caosdb-edit-min-width-warning d-lg-none d-none" role="alert"><strong>Warning</strong> The edit mode is optimized for screens wider than 992px. If you have trouble using it, please	try accessing it on a larger screen.</div>');
+        $(".navbar").append(min_width_warning);
+
         return edit_mode_li[0];
     }
 
-    this.toggle_edit_mode = async function() {
+    this.toggle_edit_mode = async function () {
         edit_mode.toggle_edit_panel();
         if (edit_mode.is_edit_mode()) {
             await edit_mode.leave_edit_mode();
@@ -553,21 +567,20 @@ var edit_mode = new function() {
      * To be overridden by an instance of `leave_edit_mode_template` during the
      * `enter_edit_mode()` execution.
      */
-    this.leave_edit_mode = function() {}
+    this.leave_edit_mode = function () {}
 
 
-    this.enter_edit_mode = async function(editApp = undefined) {
+    /**
+     * Initializes the edit mode and loads the tool box.
+     */
+    this.enter_edit_mode = async function (editApp = undefined) {
         window.localStorage.edit_mode = "true";
 
-        var editPanel = edit_mode.get_edit_panel();
-        removeAllWaitingNotifications(editPanel);
-        this.add_wait_datamodel_info();
-
         try {
-            const model = await edit_mode.retrieve_data_model();
             $(".caosdb-f-btn-toggle-edit-mode").text("Leave Edit Mode");
 
-            edit_mode.init_tool_box(model);
+            edit_mode.init_tool_box();
+            edit_mode.init_dragable();
 
             var nextEditApp = editApp;
             if (typeof nextEditApp == "undefined") {
@@ -575,7 +588,7 @@ var edit_mode = new function() {
             }
 
             edit_mode.init_new_buttons(nextEditApp);
-            edit_mode.leave_edit_mode = function() {
+            edit_mode.leave_edit_mode = function () {
                 edit_mode.leave_edit_mode_template(nextEditApp);
             };
 
@@ -585,18 +598,57 @@ var edit_mode = new function() {
         }
     }
 
+    /**
+     * (Re-)load the toolbox, i.e. retrieve Properties and RecordTypes
+     */
+    this.load_edit_mode_toolbox = async function () {}
+
+    /**
+     * Retrieve all properties and record types and convert them into
+     * a web page using a specialized XSLT named entity palette.
+     *
+     * @return {Promise<XMLDocument>} An array of entities in xml representation.
+     */
+    this.retrieve_data_model = async function () {
+        const props_prom = connection.get("Entity/?query=FIND Property");
+        const rts_prom = connection.get("Entity/?query=FIND RecordType");
+
+        const [props, rts] = await Promise.all([props_prom, rts_prom]);
 
-    this.retrieve_data_model = retrieve_data_model;
+        // add all properties to rts
+        for (var p of props.children[0].children) {
+            rts.documentElement.appendChild(p.cloneNode());
+        }
+        return rts;
+    }
 
+    /**
+     * @param {Promise<XMLElement[]>} xml - an array of XMLElements.
+     * @return {Promise<HTMLDocument>} an HTMLElements.
+     */
+    this.transform_entity_palette = async function _tME(xml) {
+        var xsl = transformation.retrieveXsltScript("entity_palette.xsl");
+        let html = await asyncXslt(xml, xsl);
+        return html;
+    }
 
-    this.init_tool_box = function(model) {
 
-        var editPanel = edit_mode.get_edit_panel();
-        removeAllWaitingNotifications(editPanel);
 
-        editPanel.innerHTML = xml2str(model);
-        edit_mode.init_dragable();
+    /**
+     * Remove all warnings and set the HTML of the toolbox panel to
+     * the model given by model.
+     */
+    this.init_tool_box = async function () {
+        // remove previously added model
+        $(".caosdb-f-edit-mode-existing").remove()
 
+        const editPanel = $(edit_mode.get_edit_panel());
+        removeAllWaitingNotifications(editPanel[0]);
+        editPanel.append(createWaitingNotification("Please wait."));
+        const model = await edit_mode.transform_entity_palette(edit_mode.retrieve_data_model());
+
+        removeAllWaitingNotifications(editPanel[0]);
+        editPanel.children()[0].appendChild(model);
     }
 
 
@@ -607,9 +659,9 @@ var edit_mode = new function() {
      *
      * @param {HTMLElement} entity
      */
-    this.init_actions_panels = function(entity) {
+    this.init_actions_panels = function (entity) {
         this.reset_actions_panels([entity]);
-        $(entity).find(".caosdb-entity-actions-panel").each(function(index) {
+        $(entity).find(".caosdb-entity-actions-panel").each(function (index) {
             var clone = $(this).clone(true)[0];
             $(clone).removeClass("caosdb-entity-actions-panel").addClass("caosdb-f-edit-mode-entity-actions-panel").insertBefore(this);
             $(clone).children().remove();
@@ -622,19 +674,27 @@ var edit_mode = new function() {
      *
      * @param {HTMLElements[]} array of entities in HTML representation.
      */
-    this.reset_actions_panels = function(entities) {
+    this.reset_actions_panels = function (entities) {
         $(entities).find(".caosdb-f-edit-mode-entity-actions-panel").remove();
         $(entities).find(".caosdb-entity-actions-panel").show();
     }
 
-    this.make_header_editable = function(entity) {
+    this.make_header_editable = function (entity) {
         var header = $(entity).find('.caosdb-entity-panel-heading');
         var roleElem = $(header).find('.caosdb-f-entity-role');
         roleElem.detach();
         var parentsElem = $(header).find('.caosdb-f-parent-list');
         parentsElem.detach();
-        const parentsSection = $('<div class="form-group"><label class="col-sm-2 control-label">parents</label><div class="col-sm-10"></div></div>');
-        parentsSection.find("div.col-sm-10").append(parentsElem);
+        const parentsSection = $(`
+      <div class="row">
+        <div class="col-2 text-end">
+          <label class="col-form-label">parents</label>
+        </div>
+        <div class="col caosdb-f-parents-form-element">
+        </div>
+      </div>
+      `);
+        parentsSection.find("div.caosdb-f-parents-form-element").append(parentsElem);
 
         header.attr("title", "Drop parents from the right panel here.");
         header.data("toggle", "tooltip");
@@ -671,11 +731,11 @@ var edit_mode = new function() {
         edit_mode.add_parent_delete_buttons(header[0]);
     }
 
-    this.isListDatatype = function(datatype) {
+    this.isListDatatype = function (datatype) {
         return (typeof datatype !== 'undefined' && datatype.substring(0, 5) == "LIST<");
     }
 
-    this.unListDatatype = function(datatype) {
+    this.unListDatatype = function (datatype) {
         return datatype.substring(5, datatype.length - 1);
     }
 
@@ -694,7 +754,7 @@ var edit_mode = new function() {
      *
      * @param {HTMLElement} form - The form containing the input fields.
      */
-    this.make_datatype_input_logic = function(form) {
+    this.make_datatype_input_logic = function (form) {
         const datatype = form_elements.get_fields(form, "atomic_datatype");
 
         $(datatype).find("select").change(function () {
@@ -738,38 +798,38 @@ var edit_mode = new function() {
      * @param {string} unit - the initial value of the input element.
      * @returns {HTMLElement} - a labeled form field.
      */
-    this.make_unit_input = function(unit) {
+    this.make_unit_input = function (unit) {
         const unit_input = $(form_elements
-                .make_text_input({
-                    name: "unit",
-                    label: "unit",
-                    value: unit,
-                }));
-        unit_input.toggleClass("form-group", true);
+            .make_text_input({
+                name: "unit",
+                label: "unit",
+                value: unit,
+            }));
+        unit_input.toggleClass("form-control", true);
         unit_input.find(".col-sm-3").toggleClass("col-sm-2", true).toggleClass("col-sm-3", false);
         unit_input.find(".col-sm-9").toggleClass("col-sm-2", true).toggleClass("col-sm-9", false);
         return unit_input[0];
     }
 
     this._known_atomic_datatypes = [
-            "TEXT",
-            "DOUBLE",
-            "INTEGER",
-            "DATETIME",
-            "BOOLEAN",
-            "FILE",
-            "REFERENCE",
-        ];
+        "TEXT",
+        "DOUBLE",
+        "INTEGER",
+        "DATETIME",
+        "BOOLEAN",
+        "FILE",
+        "REFERENCE",
+    ];
 
     /**
      * Make three input elements which contain all necessary parts of a datatype.
      *
-     * The three input elements are wrapped in a single DIV.form-group.
+     * The three input elements are wrapped in a single DIV.form-control.
      *
      * @param {string} [datatype] - defaults to TEXT if undefined.
      * @returns {HTMLElement}
      */
-    this.make_datatype_input = function(datatype) {
+    this.make_datatype_input = function (datatype) {
         var _datatype = datatype || "TEXT";
 
         // split/convert datatype string into more practical variables.
@@ -806,7 +866,7 @@ var edit_mode = new function() {
             make_value: getEntityName,
         };
         const ref_selector = form_elements
-                .make_reference_drop_down(reference_config);
+            .make_reference_drop_down(reference_config);
 
 
         // generate the checkbox ([ ] list)
@@ -816,25 +876,24 @@ var edit_mode = new function() {
             checked: is_list,
         }
         const list_checkbox = form_elements
-                .make_checkbox_input(list_checkbox_config);
+            .make_checkbox_input(list_checkbox_config);
 
         // styling
-        $(list_checkbox).children().toggleClass("col-sm-3",false).toggleClass("col-sm-9", false).toggleClass("col-sm-1", true);
-
-        const form_group = $('<div class="form-group">').append([datatype_selector, ref_selector, list_checkbox]);
-        form_group.find(".form-group").toggleClass("form-group", false);
-        form_group.find(".col-sm-3").toggleClass("col-sm-2", true).toggleClass("col-sm-3", false);
+        //$(list_checkbox).children().toggleClass("col-sm-3",false).toggleClass("col-sm-9", false).toggleClass("col-sm-1", true);
+        $(list_checkbox).find(".caosdb-f-property-value").toggleClass("my-auto", true)
+        const form_group = $('<div class="">').append([datatype_selector, ref_selector, list_checkbox]);
+        form_group.find(".col-sm-3").toggleClass("text-end", true).toggleClass("col-sm-2", true).toggleClass("col-sm-3", false);
         form_group.find(".col-sm-9").toggleClass("col-sm-3", true).toggleClass("col-sm-9", false);
 
 
         return form_group[0];
     }
 
-    this.make_input = function(label, value) {
-        return $('<div class="form-group"><label class="col-sm-2 control-label">' + label + '</label><div class="col-sm-10"><input type="text" class="form-control caosdb-f-entity-' + label + '" value="' + (typeof value == 'undefined' ? "" : value) + '"></input></div></div>')[0];
+    this.make_input = function (label, value) {
+        return $('<div class="row"> <div class="col-2 text-end"> <label class="col-form-label">' + label + ' </label> </div> <div class="col caosdb-f-parents-form-element"> <input type="text" class="form-control caosdb-f-entity-' + label + '" value="' + (typeof value == 'undefined' ? "" : value) + '"></input> </div> </div>')[0];
     }
 
-    this.smooth_replace = function(from, to) {
+    this.smooth_replace = function (from, to) {
         $(to).hide();
         $(from).fadeOut();
         $(from).after(to);
@@ -843,22 +902,22 @@ var edit_mode = new function() {
     }
 
     /**
-      * Create an input element for a single property's value.
-      *
-      * @param {object} property - entity property object.
-      * @param {HTMLElements[]} [options] - an array of OPTION elements
-      *     which represent possible candidates for reference values. The
-      *     options will be appended to the SELECT input. This parameter is
-      *     optional and only used for reference properties. This parameter
-      *     might as well be a Promise for such an array.
-      */
-    this.createElementForProperty = function(property, options) {
+     * Create an input element for a single property's value.
+     *
+     * @param {object} property - entity property object.
+     * @param {HTMLElements[]} [options] - an array of OPTION elements
+     *     which represent possible candidates for reference values. The
+     *     options will be appended to the SELECT input. This parameter is
+     *     optional and only used for reference properties. This parameter
+     *     might as well be a Promise for such an array.
+     */
+    this.createElementForProperty = function (property, options) {
         var result;
         if (property.datatype == "TEXT") {
             result = `<textarea>${property.value || ""}</textarea>`;
         } else if (property.datatype == "DATETIME") {
             var dateandtime = [""];
-            if(property.value) {
+            if (property.value) {
                 dateandtime = caosdb2InputDate(property.value);
             }
             let date = dateandtime[0];
@@ -895,10 +954,10 @@ var edit_mode = new function() {
      * @param {object} property - a property object.
      * @returns {HTMLElement} a SPAN element.
      */
-    this.generate_list_item_control_panel = function(property, options) {
+    this.generate_list_item_control_panel = function (property, options) {
         // Add list delete buttons:
-        var deleteButton = $('<button title="Delete this list element." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><span class="glyphicon glyphicon-trash"></span></button>');
-        $(deleteButton).click(function() {
+        var deleteButton = $('<button title="Delete this list element." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><i class="bi-trash"></i></button>');
+        $(deleteButton).click(function () {
             var ol = this.parentElement.parentElement.parentElement;
 
             $(this.parentElement.parentElement).remove();
@@ -907,8 +966,8 @@ var edit_mode = new function() {
 
 
         // Add list insert buttons:
-        var insertButton = $('<button title="Insert a new list element before this element." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><span class="glyphicon glyphicon-plus"></span></button>');
-        $(insertButton).click(function() {
+        var insertButton = $('<button title="Insert a new list element before this element." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><i class="bi-plus"></i></button>');
+        $(insertButton).click(function () {
             // TODO MERGE WITH OTHER PLACES WHERE THIS STRING APPEARS
             var proptemp = {
                 list: false,
@@ -937,7 +996,7 @@ var edit_mode = new function() {
     /**
      *
      */
-    this.create_unit_field = function(unit) { 
+    this.create_unit_field = function (unit) {
         return $(`<input class='caosdb-unit' title='unit' style='width: 60px;' placeholder='unit' value='${unit||""}' type='text'></input>`)[0];
     }
 
@@ -952,10 +1011,10 @@ var edit_mode = new function() {
      * @param {object} property - a property object.
      * @return {HTMLElement[]}
      */
-    this.create_value_inputs = function(property) {
+    this.create_value_inputs = function (property) {
         logger.trace("enter create_value_inputs", arguments);
 
-        var result = [ ];
+        var result = [];
         if (!property.list) {
             var options = property.reference ? edit_mode.retrieve_datatype_list(property.datatype) : undefined;
             result.push(edit_mode.createElementForProperty(property, options));
@@ -971,7 +1030,7 @@ var edit_mode = new function() {
                 result.push(edit_mode.create_unit_field(property.unit));
             }
 
-            for (var i=0; i<property.value.length; i++) {
+            for (var i = 0; i < property.value.length; i++) {
                 // TODO MERGE WITH OTHER PLACES WHERE THIS STRING APPEARS
                 var proptemp = {
                     list: false,
@@ -989,8 +1048,8 @@ var edit_mode = new function() {
             }
 
             // PLUS-button for appending inputs to the list.
-            var insertButton = $('<button title="Append a new field at the end." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><span class="glyphicon glyphicon-plus"></span></button>');
-            $(insertButton).click(function() {
+            var insertButton = $('<button title="Append a new field at the end." class="btn btn-link caosdb-update-entity-button caosdb-f-list-item-button"><i class="bi-plus"></i></button>');
+            $(insertButton).click(function () {
                 // TODO MERGE WITH OTHER PLACES WHERE THIS STRING APPEARS
                 var proptemp = {
                     list: false,
@@ -1012,7 +1071,8 @@ var edit_mode = new function() {
 
             result = result.concat([inputs[0],
                 $("<span>Insert element at the end of the list: </span>")
-                    .append(insertButton)[0]]);
+                .append(insertButton)[0]
+            ]);
         }
         return result;
 
@@ -1038,11 +1098,11 @@ var edit_mode = new function() {
      *
      * @see {@link _toggle_list_property} which is the most prominent callee.
      */
-    this._toggle_list_property_object = function(element, toList) {
+    this._toggle_list_property_object = function (element, toList) {
         const property = edit_mode.getPropertyFromElement(element);
 
         // property.list XAND toList
-        if(property.list ? toList : !toList) {
+        if (property.list ? toList : !toList) {
             // already in desired state.
             return undefined;
         }
@@ -1055,7 +1115,7 @@ var edit_mode = new function() {
         if (!toList && $.isArray(property.value) && property.value.length < 2) {
             property.value = property.value[0] || "";
         } else if (toList && !$.isArray(property.value)) {
-            property.value = [ property.value ]
+            property.value = [property.value]
         } else {
             throw new Error(`Could not toggle to list=${toList} with value=${property.value}.`);
         }
@@ -1075,12 +1135,12 @@ var edit_mode = new function() {
      * @see {@link _toggle_list_property_object} which does the actual
      * conversion work.
      */
-    this._toggle_list_property = function(element, toList) {
+    this._toggle_list_property = function (element, toList) {
         logger.trace("enter _toggle_list_property", arguments);
 
         let property = edit_mode._toggle_list_property_object(element, toList);
 
-        if(!property) {
+        if (!property) {
             // already in desired state.
             return;
         }
@@ -1099,7 +1159,7 @@ var edit_mode = new function() {
     }
 
 
-    this.change_property_data_type = function(element, datatype) {
+    this.change_property_data_type = function (element, datatype) {
         $(element).find(".caosdb-property-datatype").text(datatype);
         element.dispatchEvent(edit_mode.property_data_type_changed);
     }
@@ -1114,7 +1174,7 @@ var edit_mode = new function() {
     this.add_toggle_list_checkbox = function (element, list, datatype) {
         var editfield = $(element).find(".caosdb-f-property-value");
         var label = $('<label>List</label>');
-        var checkbox = $('<input type="checkbox" class="caosdb-f-entity-is-list"/>');
+        var checkbox = $('<input type="checkbox" class="form-check-input caosdb-f-entity-is-list"/>');
         $(element).find(".caosdb-property-edit").prepend(label.append(checkbox));
 
         checkbox.prop("checked", list);
@@ -1131,7 +1191,7 @@ var edit_mode = new function() {
         // disable checkbox when list has more than 1 element
         let disabled = editfield.find("li").length > 1;
         checkbox.prop("disabled", disabled);
-        const listDatatype = list ? datatype.substring(5, datatype.length-1) : datatype;
+        const listDatatype = list ? datatype.substring(5, datatype.length - 1) : datatype;
         if (disabled) {
             checkbox.attr("title", `You must remove all elements of the list but one by clicking the trash buttons (to the left) before you can toggle the LIST<${listDatatype}>`);
         } else {
@@ -1142,23 +1202,23 @@ var edit_mode = new function() {
         // list has more than one element.
         editfield[0].addEventListener(
             edit_mode.list_value_input_added.type, (e) => {
-            let disabled = editfield.find("li").length > 1;
-            checkbox.prop("disabled", disabled);
-            if (disabled) {
-                checkbox.attr("title", `You must remove all elements of the list but one by clicking the trash buttons (to the left) before you can toggle the LIST<${listDatatype}>`);
-            }
-        }, true);
+                let disabled = editfield.find("li").length > 1;
+                checkbox.prop("disabled", disabled);
+                if (disabled) {
+                    checkbox.attr("title", `You must remove all elements of the list but one by clicking the trash buttons (to the left) before you can toggle the LIST<${listDatatype}>`);
+                }
+            }, true);
 
         // enable the checkbox when elements removed to the list and the number
         // of elements is smaller than 2.
         editfield[0].addEventListener(
             edit_mode.list_value_input_removed.type, (e) => {
-            let disabled = editfield.find("li").length > 1;
-            checkbox.prop("disabled", disabled);
-            if (!disabled) {
-                checkbox.attr("title", `Toggle LIST<${listDatatype}> data type of this property.`);
-            }
-        }, true);
+                let disabled = editfield.find("li").length > 1;
+                checkbox.prop("disabled", disabled);
+                if (!disabled) {
+                    checkbox.attr("title", `Toggle LIST<${listDatatype}> data type of this property.`);
+                }
+            }, true);
     }
 
     /**
@@ -1177,20 +1237,21 @@ var edit_mode = new function() {
      *
      * @param {HTMLElement} element - entity property in HTML representation.
      */
-    this.make_property_editable = function(element) {
+    this.make_property_editable = function (element) {
         caosdb_utils.assert_html_element(element, "param 'element'");
 
         var editfield = $(element).find(".caosdb-f-property-value")
-            .removeClass("col-sm-8")
-            .addClass("col-sm-6")
+            .removeClass("col-sm-6")
+            .removeClass("col-md-8")
+            .addClass("col-sm-4")
+            .addClass("col-md-6")
             .addClass("caosdb-v-property-value-inputs")
-            .after(`<div class="col-sm-2 caosdb-v-property-other-inputs caosdb-property-edit" style="text-align: right;"/>`);
+            .after(`<div class="col-sm-2 col-sm-2 caosdb-v-property-other-inputs caosdb-property-edit" style="text-align: right;"/>`);
         var property = getPropertyFromElement(element);
 
 
         // create inputs
-        var inputs = edit_mode
-            .create_value_inputs(property);
+        var inputs = edit_mode.create_value_inputs(property);
         editfield.children().remove();
         editfield.append(inputs);
 
@@ -1198,10 +1259,17 @@ var edit_mode = new function() {
         edit_mode.add_toggle_list_checkbox(element, property.list, property.datatype);
 
         // TRASH BUTTON
-        edit_mode.add_property_trash_button($(element).find(".caosdb-property-edit")[0],element);
+        edit_mode.add_property_trash_button($(element).find(".caosdb-property-edit")[0], element);
     }
 
-    this.create_new_record = async function(recordtype_id, name = undefined) {
+
+    /**
+     * Create a new Record using an existing RecordType.
+     * The RecordType can be specified using recordtype_id.
+     *
+     * Currently name is ignored. TODO: check whether that behavior is intended.
+     */
+    this.create_new_record = async function (recordtype_id, name = undefined) {
         var rt = await retrieve(recordtype_id);
         var newrecord = createEntityXML("Record", undefined, undefined,
             getProperties(rt[0]),
@@ -1215,20 +1283,26 @@ var edit_mode = new function() {
         return x[0];
     }
 
-
-    this.init_dragable = function() {
-        var props = document.getElementsByClassName("caosdb-f-edit-drag");
-        for (var pel of props) {
-            pel.addEventListener("dragstart", edit_mode.dragstart);
-            pel.setAttribute("draggable", true);
-        }
+    /**
+     * All draggable elements (that are those which have a css class
+     * caosdb-f-edit-drag are added the correct drag listener and the attribute draggable.
+     *
+     * This is now done using bubbling so that the listeners are also dynamically updated.
+     */
+    this.init_dragable = function () {
+        // Bubbling: Add the listener to the document and check whether the class is present.
+        document.addEventListener("dragstart", function (event) {
+            if (event.target.classList.contains("caosdb-f-edit-drag")) {
+                edit_mode.dragstart(event);
+            }
+        });
     }
 
-    /*
+    /**
      * This function treats the deletion of entities, i.e. when the "delete"
      * button is clicked.
      */
-    this.delete_action = async function(entity) {
+    this.delete_action = async function (entity) {
         var app = edit_mode.app;
 
         // show waiting notification
@@ -1272,33 +1346,19 @@ var edit_mode = new function() {
     }
 
 
-    this.disable_new_buttons = function() {
+    this.disable_new_buttons = function () {
         var new_buttons = $('.caosdb-f-edit-panel-new-button');
         new_buttons.attr("disabled", true);
     }
 
-    this.enable_new_buttons = function() {
+    this.enable_new_buttons = function () {
         var new_buttons = $('.caosdb-f-edit-panel-new-button');
         new_buttons.attr("disabled", false);
     }
 
-    this.init_new_buttons = function(app) {
+    this.init_new_buttons = function (app) {
         var new_buttons = $('.caosdb-f-edit-panel-new-button');
 
-        // Show a button "+" to create a new property when filter results in empty list.
-        new_buttons.filter('.caosdb-f-hide-on-empty-input').parent().each(function(index) {
-            var button = $(this);
-            button.hide();
-            var input = button.parent().find("input");
-            input.on("input", function(e) {
-                if (input.val() == '') {
-                    button.fadeOut();
-                } else {
-                    button.fadeIn();
-                }
-            });
-        });
-
         // handler for new property button
         // calls newEntity transition of state machine
         new_buttons.filter('.new-property').click(() => {
@@ -1349,7 +1409,7 @@ var edit_mode = new function() {
      *
      * `finish` is triggered automatically when leaving the edit mode and does a little cleanup.
      */
-    this.init_edit_app = function() {
+    this.init_edit_app = function () {
 
 
         var app = new StateMachine({
@@ -1389,9 +1449,9 @@ var edit_mode = new function() {
         });
 
 
-        var init_drag_n_drop = function() {
+        var init_drag_n_drop = function () {
             const state = app.state;
-            $('.caosdb-entity-panel').each(function(index) {
+            $('.caosdb-entity-panel').each(function (index) {
                 let entity = this;
                 if ($(entity).is("[data-version-successor]")) {
                     // not the latest version -> ignore
@@ -1414,22 +1474,24 @@ var edit_mode = new function() {
         }
 
         // Define the error handler for the state machine.
-        app.errorHandler = function(fn) {
+        app.errorHandler = function (fn) {
             try {
                 fn();
             } catch (e) {
                 edit_mode.handle_error(e);
             }
         };
-        app.onAfterTransition = function(e) {
+        app.onAfterTransition = function (e) {
             init_drag_n_drop();
         }
-        app.onEnterInitial = async function(e) {
+        app.onEnterInitial = async function (e) {
+            $(".caosdb-f-edit-mode-existing").toggleClass("d-none", true);
+            $(".caosdb-f-edit-mode-create-buttons").toggleClass("d-none", false);
             app.old = undefined;
             app.errorHandler(() => {
                 // make entities dropable and freezable
                 edit_mode.enable_new_buttons();
-                $('.caosdb-entity-panel').each(function(index) {
+                $('.caosdb-entity-panel').each(function (index) {
                     let entity = this;
                     if ($(entity).is("[data-version-successor]")) {
                         // not the latest version -> ignore
@@ -1459,9 +1521,9 @@ var edit_mode = new function() {
                 });
             });
         };
-        app.onLeaveInitial = function(e) {
+        app.onLeaveInitial = function (e) {
             app.errorHandler(() => {
-                $('.caosdb-entity-panel').each(function(index) {
+                $('.caosdb-entity-panel').each(function (index) {
                     // add the save button an so on
                     edit_mode.remove_start_edit_button(this);
                     edit_mode.remove_new_record_button(this);
@@ -1470,7 +1532,7 @@ var edit_mode = new function() {
             });
             edit_mode.disable_new_buttons();
         };
-        app.onBeforeStartEdit = function(e, entity) {
+        app.onBeforeStartEdit = function (e, entity) {
             edit_mode.unhighlight();
             app.old = entity;
             app.entity = $(entity).clone(true)[0];
@@ -1483,11 +1545,11 @@ var edit_mode = new function() {
 
             edit_mode.freeze_but(app.entity);
         };
-        app.onBeforeCancel = function(e) {
+        app.onBeforeCancel = function (e) {
             edit_mode.smooth_replace(app.entity, app.old);
             edit_mode.unfreeze();
         };
-        app.onUpdate = function(e, entity) {
+        app.onUpdate = function (e, entity) {
             edit_mode.update_entity(entity).then(response => {
                 return transformation.transformEntities(response);
             }, edit_mode.handle_error).then(entities => {
@@ -1496,7 +1558,11 @@ var edit_mode = new function() {
                 app.showResults();
             }, edit_mode.handle_error);
         };
-        app.onEnterChanged = function(e) {
+        app.onEnterChanged = function (e) {
+            // show existing entities in toolbox
+            $(".caosdb-f-edit-mode-existing").toggleClass("d-none", false);
+            $(".caosdb-f-edit-mode-create-buttons").toggleClass("d-none", true);
+
             edit_mode.unhighlight();
             hintMessages.removeMessages(app.old);
             edit_mode.make_header_editable(app.entity);
@@ -1509,18 +1575,18 @@ var edit_mode = new function() {
             for (var element of prop_elements) {
                 edit_mode.make_property_editable(element);
             }
-            if(getEntityRole(app.entity) != "Property") {
-              edit_mode.add_property_dropzone(app.entity);
+            if (getEntityRole(app.entity) != "Property") {
+                edit_mode.add_property_dropzone(app.entity);
             }
             app.entity.dispatchEvent(edit_mode.start_edit);
         }
-        app.onEnterWait = function(e) {
+        app.onEnterWait = function (e) {
             edit_mode.smooth_replace(app.entity, app.waiting);
         }
-        app.onLeaveWait = function(e) {
+        app.onLeaveWait = function (e) {
             edit_mode.smooth_replace(app.waiting, app.entity);
         }
-        app.onBeforeNewEntity = function(e, entity) {
+        app.onBeforeNewEntity = function (e, entity) {
             if (typeof entity == "undefined") {
                 throw new TypeError("entity is undefined");
             }
@@ -1548,7 +1614,7 @@ var edit_mode = new function() {
 
             app.old = $('<div/>')[0];
         }
-        app.onInsert = function(e, entity) {
+        app.onInsert = function (e, entity) {
             edit_mode.insert_entity(entity).then(response => {
                 return transformation.transformEntities(response);
             }, edit_mode.handle_error).then(entities => {
@@ -1561,7 +1627,7 @@ var edit_mode = new function() {
                 app.showResults();
             }, edit_mode.handle_error);
         }
-        app.onFinish = function(e) {
+        app.onFinish = function (e) {
             // this transition is triggerd on leaving the edit mode.
             edit_mode.unhighlight();
             if (app.old) {
@@ -1569,7 +1635,7 @@ var edit_mode = new function() {
             }
             edit_mode.unfreeze();
         }
-        app.onShowResults = function(e) {
+        app.onShowResults = function (e) {
             // this transition is triggered by the response of the server on a
             // previous insert/update request.
 
@@ -1581,6 +1647,7 @@ var edit_mode = new function() {
             app.entity.dispatchEvent(edit_mode.end_edit);
             resolve_references.init();
             preview.init();
+            edit_mode.init_tool_box();
         }
         app.waiting = createWaitingNotification("Please wait.");
         $(app.waiting).hide();
@@ -1593,12 +1660,12 @@ var edit_mode = new function() {
         return app;
     }
 
-    this.has_errors = function(entity) {
+    this.has_errors = function (entity) {
         return $(entity).find(".alert.alert-danger").length > 0;
     }
 
-    this.freeze_but = function(element) {
-        $('.caosdb-f-main-entities').children().each(function(index) {
+    this.freeze_but = function (element) {
+        $('.caosdb-f-main-entities').children().each(function (index) {
             if (element != this) {
                 edit_mode.freeze_entity(this);
             }
@@ -1617,14 +1684,14 @@ var edit_mode = new function() {
             .prepend('<div>Drag and drop RecordTypes from the Edit Mode Toolbox here.</div>');
     }
 
-    this.unfreeze = function() {
-        $('.caosdb-f-main-entities').children().each(function(index) {
+    this.unfreeze = function () {
+        $('.caosdb-f-main-entities').children().each(function (index) {
             edit_mode.unfreeze_entity(this);
         });
     }
 
 
-    this._create_reference_options = function(entities) {
+    this._create_reference_options = function (entities) {
         var results = [];
 
         for (var i = 0; i < entities.length; i++) {
@@ -1660,7 +1727,7 @@ var edit_mode = new function() {
     this.fill_reference_drop_down = async function (drop_down, options) {
         var resolved_options = await options;
         var old = $(drop_down).find("option.caosdb-f-option-default");
-        if(old.length == 0) {
+        if (old.length == 0) {
             // no option selected, append all
             $(drop_down).append($(resolved_options).clone());
             return;
@@ -1687,7 +1754,7 @@ var edit_mode = new function() {
      * @returns {HTMLElement[]} array of OPTION element, representing an entity
      *     which can be referenced by the property.
      */
-    this.retrieve_datatype_list = async function(datatype) {
+    this.retrieve_datatype_list = async function (datatype) {
         var find_entity = ["FILE", "REFERENCE"].includes(datatype) ? "" : datatype;
         var entities = datatype !== "FILE" ? await edit_mode.query(`FIND Record ${find_entity}`) : [];
         var files = await edit_mode.query(`FIND File ${find_entity}`);
@@ -1701,46 +1768,51 @@ var edit_mode = new function() {
 
     }
 
-    this.highlight = function(entity) {
+    this.highlight = function (entity) {
         $(entity).find(".caosdb-v-edit-mode-dropzone")
             .addClass("caosdb-v-edit-mode-highlight");
     }
 
-    this.unhighlight = function() {
+    this.unhighlight = function () {
         $('.caosdb-v-edit-mode-highlight')
             .removeClass("caosdb-v-edit-mode-highlight");
     }
 
-    this.handle_error = function(err) {
+    this.handle_error = function (err) {
         globalError(err);
     }
 
-    this.get_edit_panel = function() {
+    this.get_edit_panel = function () {
         return $('.caosdb-f-edit-panel-body')[0];
     }
 
-    this.add_wait_datamodel_info = function() {
-        $(this.get_edit_panel()).append(createWaitingNotification("Please wait."));
+    this.toggle_edit_panel = function () {
+        //$(".caosdb-f-main").toggleClass("container-fluid").toggleClass("container");
+        $(".caosdb-f-main-entities").toggleClass("caosdb-f-main-entities-edit");
+        $(".caosdb-f-edit").toggle(); //.toggleClass("col-xs-4");
+        this._toggle_min_width_warning();
     }
 
-    this.toggle_edit_panel = function() {
-        $(".caosdb-f-main").toggleClass("container-fluid").toggleClass("container");
-        $(".caosdb-f-main-entities").toggleClass("col-xs-8");
-        $(".caosdb-f-edit").toggleClass("hidden").toggleClass("col-xs-4");
+    this._toggle_min_width_warning = function () {
+        // Somewhat counter-intuitive, but when we're not in edit mode
+        // and toggle the panel, we're entering and the warning should
+        // be shown on small screens and vice-versa.
+        $(".caosdb-edit-min-width-warning").toggleClass("d-none", edit_mode.is_edit_mode());
+        $(".caosdb-edit-min-width-warning").toggleClass("d-block", !(edit_mode.is_edit_mode()));
     }
 
-    this.leave_edit_mode_template = function(app) {
+    this.leave_edit_mode_template = function (app) {
         app.finish();
         $(".caosdb-f-btn-toggle-edit-mode").text("Edit Mode");
         edit_mode.reset_actions_panels($(".caosdb-f-main").toArray());
         window.localStorage.removeItem("edit_mode");
     }
 
-    this.is_edit_mode = function() {
+    this.is_edit_mode = function () {
         return window.localStorage.edit_mode !== undefined;
     }
 
-    this.add_cancel_button = function(ent, callback) {
+    this.add_cancel_button = function (ent, callback) {
         var cancel_btn = $('<button class="btn btn-link caosdb-update-entity-button caosdb-f-entity-cancel-button">Cancel</button>');
 
         $(ent).find(".caosdb-f-edit-mode-entity-actions-panel").append(cancel_btn);
@@ -1748,33 +1820,33 @@ var edit_mode = new function() {
         $(cancel_btn).click(callback);
     }
 
-    this.create_new_entity = async function(role) {
+    this.create_new_entity = async function (role) {
         var empty_entity = str2xml('<Response><' + role + '/></Response>');
         return (await transformation.transformEntities(empty_entity))[0];
     }
 
-    this.remove_cancel_button = function(entity) {
+    this.remove_cancel_button = function (entity) {
         $(entity).find('.caosdb-f-entity-cancel-button').remove()
     }
 
     /**
      * entity : HTMLElement
      */
-    this.freeze_entity = function(entity) {
+    this.freeze_entity = function (entity) {
         $(entity).css("pointer-events", "none").css("filter", "blur(10px)");
     }
 
     /**
      * entity : HTMLElement
      */
-    this.unfreeze_entity = function(entity) {
+    this.unfreeze_entity = function (entity) {
         $(entity).css("pointer-events", "").css("filter", "");
     }
 
     /**
      * this function is called in entity_palette.xsl
      */
-    this.filter = function(ent_type) {
+    this.filter = function (ent_type) {
         var text = $("#caosdb-f-filter-" + ent_type).val();
         if (ent_type == "properties") {
             var short_type = "p";
@@ -1815,14 +1887,14 @@ var edit_mode = new function() {
      * @return {HTMLElement} the entity form
      */
     this.edit = function (entity) {
-      if (!this.is_edit_mode()) {
-        throw Error("edit_mode is not active");
-      }
-      if (!edit_mode.app.can("startEdit")) {
-        throw Error("edit_mode.app does not allow to start the edit");
-      }
-      edit_mode.app.startEdit(entity);
-      return edit_mode.app.entity;
+        if (!this.is_edit_mode()) {
+            throw Error("edit_mode is not active");
+        }
+        if (!edit_mode.app.can("startEdit")) {
+            throw Error("edit_mode.app does not allow to start the edit");
+        }
+        edit_mode.app.startEdit(entity);
+        return edit_mode.app.entity;
     }
 
     /**
@@ -1830,19 +1902,19 @@ var edit_mode = new function() {
      * visible.
      */
     const UPDATE_PERMISSIONS = [
-       "UPDATE:DESCRIPTION",
-       "UPDATE:VALUE",
-       "UPDATE:ROLE",
-       "UPDATE:PARENT:REMOVE",
-       "UPDATE:PARENT:ADD",
-       "UPDATE:PROPERTY:REMOVE",
-       "UPDATE:PROPERTY:ADD",
-       "UPDATE:NAME",
-       "UPDATE:DATA_TYPE",
-       "UPDATE:FILE:REMOVE",
-       "UPDATE:FILE:ADD",
-       "UPDATE:FILE:MOVE",
-       "UPDATE:QUERY_TEMPLATE_DEFINITION",
+        "UPDATE:DESCRIPTION",
+        "UPDATE:VALUE",
+        "UPDATE:ROLE",
+        "UPDATE:PARENT:REMOVE",
+        "UPDATE:PARENT:ADD",
+        "UPDATE:PROPERTY:REMOVE",
+        "UPDATE:PROPERTY:ADD",
+        "UPDATE:NAME",
+        "UPDATE:DATA_TYPE",
+        "UPDATE:FILE:REMOVE",
+        "UPDATE:FILE:ADD",
+        "UPDATE:FILE:MOVE",
+        "UPDATE:QUERY_TEMPLATE_DEFINITION",
     ];
 
     /**
@@ -1856,7 +1928,7 @@ var edit_mode = new function() {
      * @parma {function} callback - the function which initializes and opens
      *     the edit form.
      */
-    this.add_start_edit_button = function(entity, callback) {
+    this.add_start_edit_button = function (entity, callback) {
         var has_any_update_permission = false;
         for (let permission of UPDATE_PERMISSIONS) {
             if (hasEntityPermission(entity, permission)) {
@@ -1875,14 +1947,14 @@ var edit_mode = new function() {
         $(button).click(callback);
     }
 
-    this.remove_start_edit_button = function(entity) {
+    this.remove_start_edit_button = function (entity) {
         $(entity).find(".caosdb-f-entity-start-edit-button").remove();
     }
 
 
-    this.add_new_record_button = function(entity, callback) {
+    this.add_new_record_button = function (entity, callback) {
         if (!hasEntityPermission(entity, "USE:AS_PARENT")) {
-          return;
+            return;
         }
         edit_mode.remove_new_record_button(entity);
         var button = $('<button title="Create a new Record from this RecordType." class="btn btn-link caosdb-update-entity-button caosdb-f-entity-new-record-button">+Record</button>');
@@ -1892,13 +1964,13 @@ var edit_mode = new function() {
         $(button).click(callback);
     }
 
-    this.remove_new_record_button = function(entity) {
+    this.remove_new_record_button = function (entity) {
         $(entity).find(".caosdb-f-entity-new-record-button").remove();
     }
 
-    this.add_delete_button = function(entity, callback) {
+    this.add_delete_button = function (entity, callback) {
         if (!hasEntityPermission(entity, "DELETE")) {
-          return;
+            return;
         }
         edit_mode.remove_delete_button(entity);
         var button = $('<button title="Delete this ' + getEntityRole(entity) + '." class="btn btn-link caosdb-update-entity-button caosdb-f-entity-delete-button">Delete</button>');
@@ -1908,26 +1980,26 @@ var edit_mode = new function() {
         $(button).click(() => {
             // hide other elements
             const _alert = form_elements.make_alert({
-              title: "Warning",
-              message: "You are going to delete this entity permanently. This cannot be undone.",
-              proceed_callback: () => {
-                  edit_mode.delete_action(entity)
-              },
-              cancel_callback: () => {
-                  $(_alert).remove();
-                  $(entity).find(".caosdb-f-edit-mode-entity-actions-panel").show();
-              },
-              proceed_text: "Yes, delete!",
-              remember_my_decision_id : "delete_entity",
+                title: "Warning",
+                message: "You are going to delete this entity permanently. This cannot be undone.",
+                proceed_callback: () => {
+                    edit_mode.delete_action(entity)
+                },
+                cancel_callback: () => {
+                    $(_alert).remove();
+                    $(entity).find(".caosdb-f-edit-mode-entity-actions-panel").show();
+                },
+                proceed_text: "Yes, delete!",
+                remember_my_decision_id: "delete_entity",
             });
-            $(_alert).addClass("text-right");
+            $(_alert).addClass("text-end");
 
             $(entity).find(".caosdb-f-edit-mode-entity-actions-panel").after(_alert).hide();
 
         });
     }
 
-    this.remove_delete_button = function(entity) {
+    this.remove_delete_button = function (entity) {
         $(entity).find(".caosdb-f-entity-delete-button").remove();
     }
 
@@ -1939,6 +2011,6 @@ var edit_mode = new function() {
 /**
  * Add the extensions to the webui.
  */
-$(document).ready(function() {
+$(document).ready(function () {
     edit_mode.init();
 });
diff --git a/src/core/js/ext_applicable.js b/src/core/js/ext_applicable.js
new file mode 100644
index 0000000000000000000000000000000000000000..6e4ae94f742e00e46f6cff609f4217100c9f4292
--- /dev/null
+++ b/src/core/js/ext_applicable.js
@@ -0,0 +1,342 @@
+/*
+ * ** header v3.0
+ * This file is a part of the CaosDB Project.
+ *
+ * Copyright (C) 2020 IndiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2020 Timm Fitschen <t.fitschen@indiscale.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * ** end header
+ */
+
+'use strict';
+
+/**
+ * Useful helpers for is_applicable functionality.
+ */
+var _helpers = function(getEntityPath) {
+
+  /**
+   * Check if an entity has a path attribute and one of a set of extensions.
+   *
+   * Note: the array of extensions must contain only lower-case strings.
+   *
+   * @param {HTMLElement} entity
+   * @param {string[]} extensions - an array of file extesions, e.g. `jpg`.
+   * @return {boolean} true iff the entity has a path with one of the
+   *     extensionss.
+   */
+  const path_has_file_extension = function(entity, extensions) {
+      const path = getEntityPath(entity);
+      if (path) {
+          for (var ext of extensions) {
+              if (path.toLowerCase().endsWith(ext)) {
+                  return true;
+              }
+          }
+      }
+      return false;
+  }
+
+  return {
+    path_has_file_extension: path_has_file_extension
+  };
+}(getEntityPath)
+
+var ext_applicable = function($, logger, is_in_view_port, load_config, getEntityPath, connection, helpers, createWaitingNotification) {
+
+  const version = "0.1";
+
+  /**
+   * Run through all creators and call the "create" function of the first
+   * creator which returns true from is_applicable(entity).
+   *
+   * @param {HTMLElement} entity
+   * @param {Creator[]} creators - list of creators
+   * @return {HTMLElement|String} content - the result of the first matching
+   *     creator.
+   */
+  const root_creator = async function (entity, creators) {
+    for (let c of creators) {
+      var is_applicable = false;
+      try {
+        is_applicable = await c.is_applicable(entity);
+      } catch (err) {
+        logger.error(`error in is_applicable function of creator`, c, err);
+        continue;
+      }
+      if (is_applicable) {
+        const content = await c.create(entity);
+        return content;
+      }
+    }
+    return undefined;
+  }
+
+  var _set_content = function (container, content) {
+    const _container = $(container);
+    _container.empty();
+
+    if (content) {
+        _container.append(content);
+    }
+  }
+
+  /**
+   * Replace the old content (if any) of the container by the new the content
+   * (created by the creators).
+   *
+   * Dispatch contentReadyEvent or noContentEvent if given.
+   *
+   * @param {HTMLElement} container
+   * @param {HTMLElement|string} [content]
+   * @param {Event} [contentReadyEvent]
+   * @param {Event} [noContentEvent]
+   */
+  const set_content = async function (container, content, contentReadyEvent, noContentEvent) {
+    try {
+      const wait = createWaitingNotification("Please wait...");
+      _set_content(container, wait);
+      const result = await content;
+      _set_content(container, result);
+      if (result && contentReadyEvent) {
+        container.dispatchEvent(contentReadyEvent);
+      } else if (!result && noContentEvent) {
+        container.dispatchEvent(noContentEvent);
+      }
+
+    } catch (err) {
+      logger.error(err);
+      const err_msg = "An error occured while loading this content.";
+      _set_content(container, err_msg);
+    }
+  }
+
+
+  /**
+   * @param {HTMLElement} entity
+   * @param {get_container_cb} get_container_cb
+   * @param {Creator[]} creators
+   * @param {Event} [contentReadyEvent]
+   * @param {Event} [noContentEvent]
+   */
+  const _root_handler = function (entity, get_container_cb, creators, contentReadyEvent, noContentEvent) {
+    const _container = get_container_cb(entity);
+    if (_container) {
+      const content = root_creator(entity, creators);
+      set_content(_container, content, contentReadyEvent, noContentEvent);
+    }
+  }
+
+
+  /**
+   * The root handler trigger call the root_handler callback on every
+   * .caosdb-entity-panel and every .caosdb-entity-preview in the viewport.
+   *
+   * @param {function} root_handler - the root handler callback.
+   */
+  var root_handler_trigger = function(root_handler) {
+    var entities = $(".caosdb-entity-panel,.caosdb-entity-preview");
+    for (let entity of entities) {
+
+      // TODO viewport + 1000 px for earlier loading
+      if (is_in_view_port(entity)) {
+        root_handler(entity);
+      }
+    }
+  }
+
+
+  /**
+   * Initialize the scroll watcher which listens on the scroll event of the
+   * window and triggers the root handler with a delay after the last
+   * scroll event.
+   *
+   * @param {integer} delay - timeout in milliseconds after the last scroll
+   *     event. After this timeout the trigger is called.
+   * @param {function} trigger - the root handler callback which is called.
+   */
+  var init_watcher = function(delay, trigger) {
+    var scroll_timeout = undefined;
+    $(window).scroll(() => {
+        if (scroll_timeout) {
+            clearTimeout(scroll_timeout);
+        }
+        scroll_timeout = setTimeout(trigger, delay);
+    });
+
+    var preview_timeout = undefined;
+
+    // init watcher on newly loaded entity previews.
+    window.addEventListener(
+      preview.previewReadyEvent.type,
+      () => {
+        if (preview_timeout) {
+          clearTimeout(preview_timeout);
+        }
+        preview_timeout = setTimeout(trigger, delay);
+      },
+      true);
+
+    // trigger for the first time
+    trigger();
+  };
+
+  /**
+   * @callback get_container_cb
+   * @param {HTMLElement} entity - the entity for which this callback shall
+   *     return the is_applicable container.
+   * @returns {HTMLElement} child of entity which is a container for the
+   *     is_applicable_app
+   */
+
+  /**
+   * @type {IsApplicableApp}
+   * @property {IsApplicableConfig} config
+   * @property {Creator[]} creators
+   * @property {function} root_handler
+   */
+
+  /**
+   * @type {IsApplicableConfig}
+   * @property {string|HTMLElement|function} fallback - Fallback content or
+   *     callback if none of the creators are applicable.
+   * @property {string} version - the version of the configuration which must
+   *     match this module's version.
+   * @property {CreatorConfig[]} creators - an array of creators.
+   */
+
+  /**
+   * make a fallback creator
+   *
+   * @return {Creator}
+   */
+  const _make_fallback_creator = function(fallback) {
+    if (fallback) {
+      return {
+        id: "_generated_fallback_creator",
+        is_applicable: (entity) => true, // always applicable
+        create: typeof fallback === "function" ? fallback : (entity) => fallback,
+      };
+    }
+    return undefined;
+  }
+
+  const _make_creator = function (c) {
+    return {
+      id: c.id,
+      is_applicable: typeof c.is_applicable === "function" ?
+                         c.is_applicable : eval(c.is_applicable),
+      create: typeof c.create === "function" ? c.create : eval(c.create)
+    };
+  }
+
+
+  /**
+   * @param {IsApplicableConfig}
+   * @return {Creator[]} creators
+   */
+  const _make_creators = function(config) {
+    const creators = [];
+    for (let c of config.creators) {
+      creators.push(_make_creator(c));
+    }
+    const fallback_creator = _make_fallback_creator(config.fallback);
+    if (fallback_creator) {
+      creators.push(fallback_creator);
+    }
+    return creators;
+  }
+
+  /**
+   * @type {CreatorConfig}
+   * @property {string} [id] - a unique id for the creator. optional, for
+   *     debuggin purposes.
+   * @property {function|string} is_applicable - If this is a string this has
+   *     to be valid javascript! An asynchronous function which accepts one
+   *     parameter, an entity in html representation, and which returns true
+   *     iff this creator is applicable for the given entity.
+   * @property {string} create - This has to be valid javascript! An
+   *     asynchronous function which accepts one parameter, an entity in html
+   *     representation. It returns a HTMLElement or text node which will be
+   *     shown in the bottom line container iff the creator is applicable.
+   */
+
+  /**
+   * @param {string} app_name - the name of this app.
+   * @param {get_container_cb} get_container_cb
+   * @return {get_container_cb} wrapped function which also checks if the
+   *     container has already been filled with the created content.
+   */
+  const _make_get_container_wrapper = function (get_container_cb, app_name) {
+    const _wrapper = function (entity) {
+      const container = get_container_cb(entity);
+      const app_done = $(container).data(app_name);
+      if(!app_done) {
+        // mark container as used
+        $(container).data(app_name, "done");
+        return container
+      }
+      // don't return the container if already used by this app
+      return undefined;
+    }
+    return _wrapper;
+  }
+
+  /**
+   * @param {string} that_version - a version string.
+   * @throws {Error} if that_version doesn't match this modules version.
+   */
+  const _check_version = function(that_version) {
+    if(that_version != version) {
+      throw new Error(`Wrong version in config. Was '${that_version}', should be '${version}'.`);
+    }
+  }
+
+  /**
+   * @param {string} app_name
+   * @param {IsApplicableConfig} config
+   * @param {get_container_cb} get_container
+   * @param {Event} [contentReadyEvent]
+   * @param {Event} [noContentEvent]
+   * returns {IsApplicableApp}
+   */
+  const create_is_applicable_app = function(app_name, config, get_container, contentReadyEvent, noContentEvent) {
+    logger.debug("create_is_applicable_app", config, get_container);
+    _check_version(config["version"])
+    const creators = _make_creators(config)
+    const get_container_wrapper = _make_get_container_wrapper(get_container, app_name);
+
+    const root_handler = (entity) => _root_handler(entity, get_container_wrapper, creators, contentReadyEvent, noContentEvent);
+
+    if (config.init_watcher) {
+      init_watcher(config.delay || 500, () => {root_handler_trigger(root_handler);});
+    }
+    return {
+      config: config,
+      creators: creators,
+      root_handler: root_handler,
+    }
+  }
+
+  return {
+    create_is_applicable_app: create_is_applicable_app,
+    root_handler_trigger: root_handler_trigger,
+    init_watcher: init_watcher,
+    helpers: helpers,
+    version: version,
+  };
+
+}($, log.getLogger("ext_applicable"), resolve_references.is_in_viewport_vertically, load_config, getEntityPath, connection, _helpers, createWaitingNotification);
diff --git a/src/core/js/ext_autocomplete.js b/src/core/js/ext_autocomplete.js
index 9d99241485245ca6232a7626c04f7998579174e8..9a639fb4387a32bad128406bb7bd1f036bed5fda 100644
--- a/src/core/js/ext_autocomplete.js
+++ b/src/core/js/ext_autocomplete.js
@@ -42,12 +42,47 @@ var ext_autocomplete = new function () {
         "WHICH",
         "WITH",
         "CREATED BY",
+        "CREATED BY ME",
+        "CREATED AT",
         "CREATED ON",
+        "CREATED IN",
+        "CREATED BEFORE",
+        "CREATED UNTIL",
+        "CREATED AFTER",
+        "CREATED SINCE",
         "SOMEONE",
         "STORED AT",
         "HAS A PROPERTY",
         "HAS BEEN",
         "ANY VERSION OF",
+        "FROM",
+        "INSERTED AT",
+        "INSERTED ON",
+        "INSERTED IN",
+        "INSERTED BY",
+        "INSERTED BY ME",
+        "INSERTED BEFORE",
+        "INSERTED UNTIL",
+        "INSERTED AFTER",
+        "INSERTED SINCE",
+        "UPDATED AT",
+        "UPDATED ON",
+        "UPDATED IN",
+        "UPDATED BY",
+        "UPDATED BY ME",
+        "UPDATED BEFORE",
+        "UPDATED UNTIL",
+        "UPDATED AFTER",
+        "UPDATED SINCE",
+        "SINCE",
+        "BEFORE",
+        "ON",
+        "IN",
+        "AFTER",
+        "UNTIL",
+        "AT",
+        "BY",
+        "BY ME",
     ];
     this.version = "0.1";
 
@@ -145,7 +180,10 @@ var ext_autocomplete = new function () {
                 searchPost: this.searchPost,
             },
             noResultsText: 'No autocompletion suggestions',
-            bootstrapVersion: "3",
+            bootstrapVersion: "4",
+            /* this should be updated to 5 when
+                     bootstrap-autocomplete releases official support for bootstrap 5.
+                     Until then: let's hope the best.*/
 
         });
 
@@ -158,4 +196,4 @@ $(document).ready(function () {
     if ("${BUILD_MODULE_EXT_AUTOCOMPLETE}" == "ENABLED") {
         caosdb_modules.register(ext_autocomplete);
     }
-});
+});
\ No newline at end of file
diff --git a/src/core/js/ext_bottom_line.js b/src/core/js/ext_bottom_line.js
index 51ca8ac976314bcbe45d338e11cd2c6321f8afe2..2f40cd5c822c7153ef9fe8c40e7b06ffe70a3996 100644
--- a/src/core/js/ext_bottom_line.js
+++ b/src/core/js/ext_bottom_line.js
@@ -257,6 +257,7 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
 
     const previewShownEvent = new Event("ext_bottom_line.preview.shown");
     const previewReadyEvent = new Event("ext_bottom_line.preview.ready");
+    const previewHiddenEvent = new Event("ext_bottom_line.preview.hidden");
 
     const _css_class_preview_container = "caosdb-f-ext_bottom_line-container";
     const _css_class_preview_container_resolvable = "caosdb-f-ext_bottom_line-container-resolvable";
@@ -303,14 +304,10 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
             preview_container.empty();
             var buttons = preview_container.siblings(`.${_css_class_preview_container_button}`);
             if (element) {
-                buttons.css({
-                    "visibility": "initial"
-                });
+                buttons.toggleClass("d-none", false);
                 preview_container.append(element);
             } else {
-                buttons.css({
-                    "visibility": "hidden"
-                });
+                buttons.toggleClass("d-none", true);
             }
         } else {
             logger.error(new Error("Could not find the preview container."));
@@ -399,14 +396,16 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
      * @return {HTMLElement} the newly created container.
      */
     var add_preview_container = function(entity) {
-        const button_show = $('<button class="btn btn-xs"><span class="glyphicon glyphicon-menu-down"/> Show Preview</button>')
+        const button_show = $('<button class="btn btn-sm card-footer"><i class="bi bi-chevron-down"></i> Show Preview</button>')
             .css({
-                width: "100%"
+                width: "100%",
+                padding: "0",
             })
-            .addClass(_css_class_preview_container_button);
-        const button_hide = $('<button class="btn btn-xs"><span class="glyphicon glyphicon-menu-up"/> Hide Preview</button>')
+            .addClass(_css_class_preview_container_button)
+        const button_hide = $('<button class="btn btn-sm card-footer"><i class="bi bi-chevron-up"></i> Hide Preview</button>')
             .css({
-                width: "100%"
+                width: "100%",
+                padding: "0",
             })
             .addClass(_css_class_preview_container_button)
             .hide();
@@ -432,6 +431,9 @@ var ext_bottom_line = function($, logger, is_in_view_port, load_config, getEntit
         container.on("shown.bs.collapse", () => {
             container[0].dispatchEvent(previewShownEvent);
         });
+        container.on("hidden.bs.collapse", () => {
+            container[0].dispatchEvent(previewHiddenEvent);
+        });
         $(entity).append(container);
         $(entity).append(button_show);
         $(entity).append(button_hide);
diff --git a/src/core/js/ext_cosmetics.js b/src/core/js/ext_cosmetics.js
index 3913a37b6645e88d3a357b9c4c124cf296ccfcad..4d935a2a5afecd699fee1a24416c06b30d1adc46 100644
--- a/src/core/js/ext_cosmetics.js
+++ b/src/core/js/ext_cosmetics.js
@@ -1,26 +1,70 @@
-var cosmetics = new function() {
-    this.init = function() {
-        this.linkify();
-    }
+/*
+ * This file is a part of the CaosDB Project.
+ *
+ * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2021 Timm Fitschen <t.fitschen@indiscale.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+/**
+ * Cosmetics module is a collection of small look-and-feel tweaks for the
+ * caosdb webui.
+ *
+ * @author Timm Fitschen
+ */
+var cosmetics = new function () {
 
-    this.linkify = function() {
-        /* DEPRECATED css class .caosdb-property-text-value - Use
-        * .caosdb-f-property-single-raw-value or introduce new
-        * .caosdb-v-property-text-value */
-        $('.caosdb-property-text-value').each(function(index) {
+    var _linkify = function () {
+        $('.caosdb-f-property-text-value').each(function (index) {
+            // TODO also extract and convert links surrounded by other text
             if (/^https?:\/\//.test(this.innerText)) {
                 var uri = this.innerText;
                 var text = uri
 
                 $(this).parent().css("overflow", "hidden");
                 $(this).parent().css("text-overflow", "ellipsis");
-                $(this).html('<a href="' + uri + '"><span class="glyphicon glyphicon-new-window"></span> ' + text + '</a>');
+                $(this).html(`<a class="caosdb-v-property-href-value" href="${uri}">${text} <i class="bi bi-box-arrow-up-right"></i></a>`);
             }
         });
     }
+
+    /**
+     * Convert any text-value beginning with 'http(s)://' into a link.
+     *
+     * A listener detects edit-mode changes and previews
+     */
+    var linkify = function () {
+        _linkify();
+
+        // edit-mode-listener
+        document.body.addEventListener(edit_mode.end_edit.type, _linkify, true);
+        // preview listener
+        document.body.addEventListener(preview.previewReadyEvent.type, _linkify, true);
+    }
+
+    this.init = function () {
+        if ("${BUILD_MODULE_EXT_COSMETICS_LINKIFY}" == "ENABLED") {
+            linkify();
+        }
+    }
+
 }
 
 
-$(document).ready(function() {
-    cosmetics.init();
-});
+$(document).ready(function () {
+    caosdb_modules.register(cosmetics);
+});
\ No newline at end of file
diff --git a/src/core/js/ext_entity_state.js b/src/core/js/ext_entity_state.js
index b4f2e04eb1702636ebe45042e4e3f382efbdd1c4..101c3800fc16632f2e36778a9e0468feae43f677 100644
--- a/src/core/js/ext_entity_state.js
+++ b/src/core/js/ext_entity_state.js
@@ -158,6 +158,8 @@ const ext_entity_state = function ($, logger, edit_mode, update_state, getEntity
       $(updated_entity).find(".alert-warning, .alert-info").remove();
       edit_mode.smooth_replace(entity, updated_entity[0]);
       updated_entity[0].dispatchEvent(entity_state_transition_ready_event);
+      resolve_references.init();
+      preview.init();
     }
   }
 
diff --git a/src/core/js/ext_map.js b/src/core/js/ext_map.js
index 091cf54caf9abac2dc9d914c9c68291b3ab4a93f..719d4f77943fdfca562961838dc02d95d5fd5cb1 100644
--- a/src/core/js/ext_map.js
+++ b/src/core/js/ext_map.js
@@ -49,6 +49,13 @@ var caosdb_map = new function () {
     }, "navbar", "caosdb_utils"];
     this.logger = logger;
 
+    /**
+     * Map is initialized, map button is visible in the menu.
+     *
+     * @event caosdb_map#map_ready
+     */
+    this.map_ready = new Event("caosdb.caosdb_map.map_ready");
+
     /**
      * The MapConfig object is used to define all relevant parameters for the
      * map including the tiling servers, different views and CRSs of the map,
@@ -628,7 +635,7 @@ var caosdb_map = new function () {
             "name": "Entities on the current page.",
             "description": "Show all entities on the current page.",
             "icon": {
-                html: '<span style="color: #00F; font-size: 20px" class="glyphicon glyphicon-map-marker"></span>',
+                html: '<i class="bi-geo-alt-fill"  style="font-size: 20px; color: #00F;"></i>',
                 iconAnchor: [10, 19],
                 className: "",
             },
@@ -650,7 +657,7 @@ var caosdb_map = new function () {
             "name": "All entities",
             "description": "Show all entities with coordinates.",
             "icon": {
-                html: '<span style="color: #F00; font-size: 20px" class="glyphicon glyphicon-map-marker"></span>',
+                html: '<i class="bi-geo-alt-fill"  style="font-size: 20px; color: #F00;"></i>',
                 iconAnchor: [10, 19],
                 className: "",
             },
@@ -727,7 +734,7 @@ var caosdb_map = new function () {
         this.create_toggle_map_button = function (content = "Map") {
             logger.trace("enter create_toggle_map_button");
             let button = $(
-                `<button class="navbar-btn btn btn-link"/>`);
+                `<a class="nav-link" role="button"></a>`);
             button.toggleClass("caosdb-f-toggle-map-button", true);
             button.text(content);
             logger.trace("leave create_toggle_map_button");
@@ -742,13 +749,7 @@ var caosdb_map = new function () {
             panel.toggleClass("caosdb-f-map-panel", true);
 
             // for centered and responsive display
-            panel.toggleClass("container", true);
-
-            // TODO move to css file
-            $(panel).css({
-                "height": "500px"
-            });
-
+            panel.toggleClass(["container", "mb-2"], true);
 
             return panel[0];
         }
@@ -797,7 +798,9 @@ var caosdb_map = new function () {
                     config.tileLayer.type);
             }
 
-            var map = L.map(container, config);
+            const wrapped = $("<div/>");
+            $(container).append(wrapped);
+            var map = L.map(wrapped[0], config);
             map._crs = config.crs;
             tileLayer.addTo(map);
 
@@ -867,6 +870,13 @@ var caosdb_map = new function () {
         }
 
 
+        this.show_map = function () {
+            logger.trace("enter show_map");
+            $(".caosdb-f-map-panel").show(900, () => this
+                ._toggle_cb());
+        }
+
+
         /**
          * To be called after the map panel has been toggled.
          */
@@ -956,6 +966,8 @@ var caosdb_map = new function () {
          * 3) initialize the container panel
          * 4) inttialize the map itself
          * 5) add the map toggle button to the navbar
+         *
+         * @fires caosdb_map#map_ready
          */
         this.init = async function () {
             logger.trace("enter init");
@@ -978,6 +990,7 @@ var caosdb_map = new function () {
                 // TODO split in smaller pieces and move callback to separate function
                 this.change_map_view = (view) => {
                     if (this._map) {
+			this._map._container.remove();
                         this._map.remove();
                     }
 
@@ -1065,6 +1078,12 @@ var caosdb_map = new function () {
                 this.change_map_view();
 
                 toggle_button = this.init_toggle_map_button();
+
+                // indicate that the map is ready: map button is present and
+                // map is hidden or shown but initialized in either case.
+                this._map.whenReady(()=>{
+                  document.body.dispatchEvent(caosdb_map.map_ready);
+                });
             } catch (err) {
                 logger.error("Could not initialize the map.",
                     err);
@@ -1243,7 +1262,7 @@ var caosdb_map = new function () {
                 ".caosdb-f-shortcuts-panel-toggle-button:not('.caosdb-f-shortcuts-panel-hidden')"
             ).click();
 
-            query_panel
+            $("#caosdb-query-panel-collapsible")
                 .collapse("show");
 
             // fill query into text field
@@ -1426,7 +1445,7 @@ var caosdb_map = new function () {
             var parents = getParents(entity);
             var ret = [];
             for (const par of parents) {
-                var label = $('<span class="label">' + par.name +
+                var label = $('<span class="badge">' + par.name +
                         '</span>')
                     // TODO move to global css
                     .css({
@@ -1458,7 +1477,7 @@ var caosdb_map = new function () {
             const link_title = entity_on_page ? "Jump to this entity." : "Browse to this entity.";
             const link = $(`<a title="${link_title}" href="${href}"/>`)
                 .addClass("pull-right")
-                .append(`<span class="glyphicon glyphicon-share-alt"/></a>`);
+                .append(`<i class="bi bi-box-arrow-up-right"></i></a>`);
 
             const name_label = $('<div/>')
                 // TODO move to global css
@@ -1665,7 +1684,7 @@ var caosdb_map = new function () {
                 // TODO refactor and extract function for map controls and
                 // merge with similar code from the select_handler.
                 var button = L.DomUtil.create("div",
-                    "leaflet-bar leaflet-control leaflet-control-custom"
+                    "leaflet-bar leaflet-control leaflet-control-custom caosdb-f-map-change-view-btn"
                 );
                 button.title = "Change the view";
                 // TODO move to css
@@ -1675,7 +1694,7 @@ var caosdb_map = new function () {
                 button.style.textAlign = "center";
                 button.style.marginTop = "2px";
                 button.innerHTML =
-                    '<span style="margin-top: 5px; font-size: 15px" class="glyphicon glyphicon-option-vertical"></span>';
+                    '<i style="font-size: 20px" class="bi-three-dots-vertical"></i>';
 
                 button.addEventListener("click", click);
                 $(button).prepend(view_menu);
@@ -1981,7 +2000,7 @@ entity.`;
                         button.style.marginTop =
                             "2px";
                         button.innerHTML =
-                            '<span style="margin-top: 5px; font-size: 15px" class="glyphicon glyphicon-search"></span>';
+                            '<i style="margin-top: 5px; font-size: 15px" class="bi-search"></i>';
                         button.onclick = callback;
 
                         $(button).on("mousedown", (
diff --git a/src/core/js/ext_table_preview.js b/src/core/js/ext_table_preview.js
index 1d9da6fa9334a52de5eb39a66b585c7eb67cd120..708d4da4b69602b4824b46e2aac082e4037b3102 100644
--- a/src/core/js/ext_table_preview.js
+++ b/src/core/js/ext_table_preview.js
@@ -55,8 +55,8 @@ var ext_table_preview  = function ($, logger, connection, getEntityPath, getEnti
             } else {
                 const tablecontent = script_result.getElementsByTagName("stdout")[0];
                 const unformatted = markdown.textToHtml(tablecontent.textContent)
-                const formatted = $('<div class="table-responsive"/>').append(unformatted);
-                formatted.find("table").addClass("table table-bordered table-condensed").removeAttr("border");
+                const formatted = $('<div/>').append(unformatted);
+                formatted.find("table").addClass("table table-responsive table-bordered table-sm").removeAttr("border");
                 return formatted[0];
             }
         } catch (err) {
diff --git a/src/core/js/ext_trigger_crawler_form.js b/src/core/js/ext_trigger_crawler_form.js
index 94ea6feb672cc3a2be8c87cb6bd6f5c8a5087d3f..0796ef77da36e730b05d70dbbd2e8728c6e65c79 100644
--- a/src/core/js/ext_trigger_crawler_form.js
+++ b/src/core/js/ext_trigger_crawler_form.js
@@ -74,8 +74,8 @@ var ext_trigger_crawler_form = function () {
               <div class="modal-content">
                 <div class="modal-header">
                   <button type="button"
-                    class="close"
-                    data-dismiss="modal"
+                    class="btn-close"
+                    data-bs-dismiss="modal"
                     aria-label="Close">
                     <span aria-hidden="true">&times;</span>
                   </button>
@@ -108,7 +108,7 @@ var ext_trigger_crawler_form = function () {
         <form method="POST" action="/scripting">
           <input type="hidden" name="call" value="${script}"/>
           <input type="hidden" name="-p0" value=""/>
-          <div class="form-group">
+          <div class="form-control">
             <input type="submit"
               class="form-control btn btn-primary" value="${button_name}"/>
           </div>
diff --git a/src/core/js/ext_xls_download.js b/src/core/js/ext_xls_download.js
index f3eac54dde17bb7d385c31e5189806facc1948e2..5ea29ba38698b7c14ad4329201b2f3104dfe57ab 100644
--- a/src/core/js/ext_xls_download.js
+++ b/src/core/js/ext_xls_download.js
@@ -62,7 +62,7 @@ var caosdb_table_export = new function () {
     }
 
     /**
-     * In order to create a valid tsv table, characters that have a special 
+     * In order to create a valid tsv table, characters that have a special
      * meaning (line break and tab) need to be removed.
      *
      * Both characters will be replaced by a single white space
diff --git a/src/core/js/footer.js b/src/core/js/footer.js
deleted file mode 100644
index c48c5cf19c405aea326b36aba2868008466a8329..0000000000000000000000000000000000000000
--- a/src/core/js/footer.js
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * ** header v3.0
- * This file is a part of the CaosDB Project.
- *
- * Copyright (C) 2019 IndiScale GmbH (info@indiscale.com)
- * Copyright (C) 2019 Daniel Hornung (d.hornung@indiscale.com)
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * ** end header
- */
-'use strict';
-
-/**
- * Call initially.
- * 
- * TODO refactor to async function for better readability.
- * @return something
- */
-function footer_initOnDocumentReady() {
-
-    var xhr = new XMLHttpRequest()
-
-    // TODO Refactor and use transformation.retrieveXsltScript, 
-    //
-    // Event better use the transformation module for injecting an entry point,
-    // because this implementation does not allow for non-HTML content in the
-    // caosdb-footer template.
-    xhr.open("GET", "/webinterface/${BUILD_NUMBER}/xsl/footer.xsl");
-    xhr.addEventListener('load', function() {
-        if (this.status != 200) {
-            // TODO use proper logging framework (log.getLogger("footer.js");)
-            console.log(this.status);
-            return;
-        }
-        var footer_xsl = this.responseXML;
-
-        var foot_content = $('[name = "caosdb-footer"]', footer_xsl)[0];
-        var fragment = document.createRange().createContextualFragment(
-            foot_content.innerHTML);
-        var footer = $("footer")[0];
-        footer.appendChild(fragment);
-
-    });
-    xhr.send();
-
-}
-
-$(document).ready(footer_initOnDocumentReady);
diff --git a/src/core/js/form_elements.js b/src/core/js/form_elements.js
index 8fe0af4ba633aaf257c48dd3e40ee22f4a8fc3c5..d01b45ee9148febc592d615a8fa947d0d53656d3 100644
--- a/src/core/js/form_elements.js
+++ b/src/core/js/form_elements.js
@@ -98,7 +98,7 @@ var form_elements = new function () {
      */
 
     this.version = "0.1";
-    this.dependencies = ["log", "caosdb_utils", "markdown"];
+    this.dependencies = ["log", "caosdb_utils", "markdown", "bootstrap"];
     this.logger = log.getLogger("form_elements");
     this.cancel_form_event = new Event("caosdb.form.cancel");
     this.submit_form_event = new Event("caosdb.form.submit");
@@ -233,7 +233,7 @@ var form_elements = new function () {
 
         // create the alert
         const _alert = $(`<div class="alert alert-${severity}
-              alert-dismissible fade in caosdb-f-form-elements-alert" role="alert">${title}
+              alert-dismissible caosdb-f-form-elements-alert" role="alert">${title}
             <p>${config.message}</p>
         </div>`);
 
@@ -242,21 +242,22 @@ var form_elements = new function () {
         if (remember) {
             const remember_my_decision_text = config.remember_my_decision_text ||
                 "Don't ask me again.";
-            checkbox = $(`<p class="checkbox"><label>
+            checkbox = $(`<p class="form-check"><label>
               <input type="checkbox"/> ${remember_my_decision_text}</label></p>`);
             _alert.append(checkbox);
         }
 
 
         // create buttons ...
-        const cancel_button = config.cancel_button || $(`<button type="button" class="btn btn-default caosdb-f-btn-alert-cancel">${cancel_text}</button>`);
+        const cancel_button = config.cancel_button || $(`<button type="button" class="btn btn-secondary caosdb-f-btn-alert-cancel">${cancel_text}</button>`);
         const proceed_button = config.proceed_button || $(`<button type="button" class="btn btn-${severity} caosdb-f-btn-alert-proceed">${proceed_text}</button>`);
         _alert.append($("<p/>").append([proceed_button, cancel_button]));
 
 
         // ... and bind callbacks to the buttons.
         cancel_button.click(() => {
-            $(_alert).alert('close');
+            var alert = bootstrap.Alert.getInstance(_alert[0]);
+            alert.close()
             if (typeof config.cancel_callback == "function") {
                 config.cancel_callback();
             }
@@ -267,10 +268,13 @@ var form_elements = new function () {
                 form_elements._set_alert_decision(config.remember_my_decision_id,
                     "proceed");
             }
-            $(_alert).alert('close');
+            var alert = bootstrap.Alert.getInstance(_alert[0]);
+            alert.close()
             config.proceed_callback();
         });
 
+        new bootstrap.Alert(_alert[0]);
+
         return _alert[0];
     }
 
@@ -486,7 +490,6 @@ var form_elements = new function () {
      * @return {ScriptingResult}
      */
     this.parse_script_result = function (result) {
-        console.log(result);
         const scriptNode = result.evaluate("/Response/script", result, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
         const code = result.evaluate("@code", scriptNode, null, XPathResult.STRING_TYPE, null).stringValue;
 
@@ -516,7 +519,7 @@ var form_elements = new function () {
         let label = this._make_input_label_str(config);
         let loading = $(createWaitingNotification("loading..."))
             .addClass("caosdb-f-field-not-ready");
-        let input_col = $('<div class="col-sm-9"/>');
+        let input_col = $('<div class="caosdb-f-property-value col-sm-9"/>');
 
         input_col.append(loading);
         this._query(config.query).then(async function (entities) {
@@ -572,8 +575,8 @@ var form_elements = new function () {
         var actions_box = select.siblings().find(".bs-actionsbox");
         if (actions_box.length === 0) {
             actions_box = $(`<div class="bs-actionsbox">
-                        <div class="btn-group btn-group-sm btn-block">
-                            <button type="button" class="actions-btn btn-default bs-deselect-all btn btn-light">None</button>
+                        <div class="btn-group btn-group-sm d-grid">
+                            <button type="button" class="actions-btn bs-deselect-all btn btn-light">None</button>
                         </div>
                     </div>`)
                 .hide();
@@ -595,9 +598,11 @@ var form_elements = new function () {
             actions_box
                 .find(".bs-deselect-all")
                 .click((e) => {
-                    select.val(null)
-                        .selectpicker("render")
-                        .parent().toggleClass("open", false);
+                    select
+                        .selectpicker("val", null);
+                    select
+                        .selectpicker("render");
+                    select.dropdown("hide");
                     select[0].dispatchEvent(form_elements.field_changed_event);
                 });
         }
@@ -798,13 +803,13 @@ var form_elements = new function () {
 
 
     this.add_help = function (field, config) {
-        var help_button = $('<span data-trigger="click focus" data-toggle="popover" class="caosdb-f-form-help pull-right glyphicon glyphicon-info-sign"/>')
+        var help_button = $('<a tabindex="0" role="button" data-bs-trigger="focus" data-bs-toggle="popover"><i class="caosdb-f-form-help pull-right bi-info-circle-fill"></i></a>')
             .css({
                 "cursor": "pointer"
             });
 
         if (typeof config === "string" || config instanceof String) {
-            help_button.attr("data-content", config);
+            help_button.attr("data-bs-content", config);
             help_button.popover();
         } else {
             help_button.popover(config);
@@ -1196,7 +1201,7 @@ var form_elements = new function () {
     }
 
     this.make_footer = function () {
-        return $('<div class="text-right caosdb-f-form-elements-footer"/>')
+        return $('<div class="text-end caosdb-f-form-elements-footer"/>')
             .css({
                 "margin": "20px",
             }).append(this.make_required_marker())
@@ -1272,10 +1277,10 @@ var form_elements = new function () {
         ret.append(to_input);
 
         // styling
-        $(from_input).toggleClass("form-group", false);
+        $(from_input).toggleClass("form-control", false);
         $(from_input).find(".col-sm-3").toggleClass("col-sm-3", false).toggleClass("col-sm-1");
         $(from_input).find(".col-sm-9").toggleClass("col-sm-9", false).toggleClass("col-sm-3");
-        $(to_input).toggleClass("form-group", false);
+        $(to_input).toggleClass("form-control", false);
         $(to_input).find(".col-sm-3").toggleClass("col-sm-3", false).toggleClass("col-sm-1").toggleClass("col-sm-offset-1");
         $(to_input).find(".col-sm-9").toggleClass("col-sm-9", false).toggleClass("col-sm-3");
 
@@ -1293,10 +1298,7 @@ var form_elements = new function () {
      */
     this._make_field_wrapper = function (name) {
         caosdb_utils.assert_string(name, "param `name`");
-        return $('<div class="form-group caosdb-f-field" data-field-name="' + name + '" />')
-            .css({
-                "padding": "0"
-            })[0];
+        return $('<div class="row caosdb-f-field caosdb-v-field" data-field-name="' + name + '" />')[0];
     }
 
     /**
@@ -1592,7 +1594,7 @@ var form_elements = new function () {
         let label = config.label;
         return label ? '<label for="' + name +
             '" data-property-name="' + name +
-            '" class="control-label col-sm-3">' + label +
+            '" class="col-form-label col-sm-3">' + label +
             '</label>' : "";
     }
 
diff --git a/src/core/js/preview.js b/src/core/js/preview.js
index b85f7b56dc13ff94aa2c3de90eb1b464d7f1e9d6..c5b7752b5070796ab01fb3d007065d2a4fc6b425 100644
--- a/src/core/js/preview.js
+++ b/src/core/js/preview.js
@@ -245,7 +245,7 @@ var preview = new function() {
      * @return {HTMLElement} A button for showing the preview carousel.
      */
     this.createShowPreviewButton = function() {
-        return $('<button class="' + preview.classNameShowPreviewButton + ' btn btn-link btn-xs" title="Show preview of the referenced entities."><span class="glyphicon glyphicon-eye-open"></button>')[0];
+        return $('<button class="' + preview.classNameShowPreviewButton + ' align-self-start btn btn-link btn-sm" title="Show preview of the referenced entities."><i class="bi-eye-fill"></i></button>')[0];
     }
 
     /**
@@ -253,7 +253,7 @@ var preview = new function() {
      * @return {HTMLElement} A button for hiding the preview carousel.
      */
     this.createHidePreviewButton = function() {
-        return $('<button class="' + preview.classNameHidePreviewButton + ' btn btn-link btn-xs" title="Hide preview and show links."><span class="glyphicon glyphicon-eye-close"></button>')[0];
+        return $('<button class="' + preview.classNameHidePreviewButton + ' align-self-start btn btn-link btn-sm" title="Hide preview and show links."><i class="bi-eye-slash-fill"></i></button>')[0];
     }
 
     /**
@@ -274,7 +274,8 @@ var preview = new function() {
      * @return {HTMLElement} parameter `ref_property_elem`
      */
     this.addShowPreviewButton = function(ref_property_elem, button_elem) {
-        ref_property_elem.getElementsByClassName("caosdb-f-property-value")[0].appendChild(button_elem);
+        caosdb_utils.assert_html_element(button_elem, "param `button_elem`");
+        $(ref_property_elem.getElementsByClassName("caosdb-f-property-value")[0]).prepend(button_elem);
         return ref_property_elem;
     }
 
@@ -381,15 +382,16 @@ var preview = new function() {
     /**
      * Create a preview carousel from an array of entity elements.
      *
-     * A carousel consists of the main div with class `carousel slide` and a unique ID which will
-     * be generated here. Inside there are the navigation bar with class 
-     * `caosdb-preview-carousel-nav`, and the inner div which contains and show the several slides
-     * with class `carousel-inner`. 
+     * A carousel consists of the main div with class `carousel slide` and a
+     * unique ID which will be generated here. Inside there are the navigation
+     * bar with class `caosdb-preview-carousel-nav`, and the inner div which
+     * contains and show the several slides with class `carousel-inner`.
      *
      * The refLinksContainer are cloned and modified such that they trigger the
-     * sliding and added to the navigation bar. Then a set of empty slides is added to the inner
-     * div. The entities are put into the correct slide using the data-slide-to attributes and  the 
-     * entity id of each selector button.
+     * sliding and added to the navigation bar. Then a set of empty slides is
+     * added to the inner div. The entities are put into the correct slide
+     * using the data-bs-slide-to attributes and the entity id of each selector
+     * button.
      *
      * @param {HTMLElement[]} entities - The array of entity elements.
      * @param {HTMLElement} refLinksContainer - The original reference links.
@@ -401,19 +403,19 @@ var preview = new function() {
         }
         let carouselId = ("previewCarousel" + preview.carouselId++);
         let nav = preview.createCarouselNav(refLinksContainer, carouselId); //preserves order, first is active
-        let N = $(nav).find('[data-slide-to]').length;
+        let N = $(nav).find('[data-bs-slide-to]').length;
         let inner = preview.createEmptyInner(N) //no content, first is active
 
         let selectorButtons = preview.getSelectorButtons(nav);
         selectorButtons.each((index, button) => {
-            let slide_id = button.getAttribute("data-slide-to");
+            let slide_id = button.getAttribute("data-bs-slide-to");
             let entity_id_version = preview.getEntityRef(button);
             let entity = preview.getEntityByIdVersion(entities, entity_id_version);
             if (entity == null) throw new Error("Entity with ID " + entity_id_version + " could not be found!");
             inner.children[slide_id].appendChild(preview.preparePreviewEntity(entity));
         });
 
-        let mainDiv = $('<div class="carousel slide" data-interval="false"></div>')[0];
+        let mainDiv = $('<div data-bs-interval="false" class="carousel slide"></div>')[0];
         mainDiv.appendChild(nav);
         mainDiv.appendChild(inner);
         mainDiv.id = carouselId;
@@ -424,14 +426,15 @@ var preview = new function() {
     }
 
     /**
-     * Get the selector buttons from a div which contains them or return the single selector button 
-     * if the `refLinksContainer` parameter is itself the selector button.
+     * Get the selector buttons from a div which contains them or return the
+     * single selector button if the `refLinksContainer` parameter is itself
+     * the selector button.
      *
      * @param {HTMLElement} refLinksContainer
      * @return {jQuery} A collection of selector buttons.
      */
     this.getSelectorButtons = function(refLinksContainer) {
-        return $(refLinksContainer).find('[data-slide-to]').addBack('[data-slide-to]');
+        return $(refLinksContainer).find('[data-bs-slide-to]');
     }
 
     /**
@@ -472,26 +475,16 @@ var preview = new function() {
      * @return {HTMLElement} The prepared entity.
      */
     this.preparePreviewEntity = function(entity) {
-        // move version modal into body because otherwise it would be displayed
-        // inside the caroussel. That would make sense but there is simply not
-        // enough space.
-        $(entity).find(".caosdb-f-entity-version-info").appendTo(document.body);
-
+        const preparedEntity = entity.cloneNode(true);
 
-        // make backref button smaller
-        $(entity).find(".caosdb-backref-link > .hidden-xs").hide();
+        const href = connection.getBasePath() + transaction.generateEntitiesUri([preview.getEntityRef(entity)]);
 
-        var preparedEntity = entity.cloneNode(true);
+        const link = $('<a title="Load this entity in a new window." href="' + href + '" class="btn" target="_blank"></a>');
+        link.append('<i class="bi bi-box-arrow-up-right"></i>');
 
-        // header is clickable:
-        let href = connection.getBasePath() + transaction.generateEntitiesUri([preview.getEntityRef(entity)]);
-        let link = $('<a title="Load this entity in a new window." href="' + href + '" class="label caosdb-id caosdb-id-button" target="_blank"></a>');
-        let entityIdElem = $(preparedEntity).find('.label.caosdb-id');
-        link.insertAfter(entityIdElem);
-        link.append(entityIdElem.text() + " ");
-        link.append('<span class="glyphicon glyphicon-new-window"/>');
-        // TODO this link is not visible due to webcaosdb.css (caosdb-id)
-        entityIdElem.remove();
+        const buttonsList = $(preparedEntity).find(".caosdb-v-entity-header-buttons-list");
+        buttonsList.children().hide();
+        buttonsList.append(link);
 
         return preparedEntity;
     }
@@ -509,9 +502,9 @@ var preview = new function() {
         if (carouselId == null) {
             throw new Error("carouselId must not be null.");
         }
-        let prevButton = $('<a role="button" style="z-index: 5;position:absolute; top: 0;left:0px" class="btn btn-default btn-sm" href="#' + carouselId + '" data-slide="prev"></a>')[0];
+        let prevButton = $('<a role="button" style="z-index: 5;position:absolute; top: 0;left:0px" class="btn btn-secondary btn-sm" href="#' + carouselId + '" data-bs-slide="prev"></a>')[0];
         prevButton.innerHTML = preview.carouselPrevButtonInnerHTML;
-        let nextButton = $('<a role="button" style="z-index: 5;position:absolute; top: 0;right:0px" class="btn btn-default btn-sm" href="#' + carouselId + '" data-slide="next"></a>')[0];
+        let nextButton = $('<a role="button" style="z-index: 5;position:absolute; top: 0;right:0px" class="btn btn-secondary btn-sm" href="#' + carouselId + '" data-bs-slide="next"></a>')[0];
         nextButton.innerHTML = preview.carouselNextButtonInnerHTML;
         let nav = $('<div class="' + preview.classNamePreviewCarouselNav + '"></div>')[0];
         let selectors = refLinksContainer.cloneNode(true);
@@ -519,11 +512,11 @@ var preview = new function() {
         // resolvable-reference class but did not resolve it yet.
 
         $(selectors).show();
-        $(selectors).find('a,button,.btn').each((index, button) => {
+        $(selectors).find('a.caosdb-f-reference-value').each((index, button) => {
             $(button).toggleClass("active", index === 0);
             button.removeAttribute("href");
-            button.setAttribute("data-slide-to", index);
-            button.setAttribute("data-target", "#" + carouselId);
+            button.setAttribute("data-bs-slide-to", index);
+            button.setAttribute("data-bs-target", "#" + carouselId);
         });
         nav.appendChild(prevButton);
         nav.appendChild(nextButton);
@@ -532,12 +525,13 @@ var preview = new function() {
         return nav;
     };
 
-    this.carouselPrevButtonInnerHTML = '<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span></span><span class="sr-only">Previous</span>';
-    this.carouselNextButtonInnerHTML = '<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span></span><span class="sr-only">Next</span>';
+    this.carouselPrevButtonInnerHTML = '<i class="bi-chevron-left" aria-hidden="true"></i><span class="visually-hidden">Previous</span>';
+    this.carouselNextButtonInnerHTML = '<i class="bi-chevron-right" aria-hidden="true"></i><span class="visually-hidden">Next</span>';
 
     /**
-     * Create a div with class `carousel-inner` which contains N divs with class `item` while
-     * the first also has class `active`. These item divs are empty.
+     * Create a div with class `carousel-inner` which contains N divs with
+     * class `carousel-item` while the first also has class `active`. These
+     * item divs are empty.
      * 
      * @param {Number} N - An integer > 0.
      * @return {HTMLElement} A Div with class `carousel-inner`.
@@ -546,8 +540,8 @@ var preview = new function() {
         if (N == null || isNaN(N) || N < 1) {
             throw new Error("N is to be an integer > 0");
         }
-        let innerDiv = $('<div class="carousel-inner"><div class="item active"></div></div>')[0];
-        let item = $('<div class="item"></div>')[0];
+        let innerDiv = $('<div class="carousel-inner"><div class="carousel-item active"></div></div>')[0];
+        let item = $('<div class="carousel-item"></div>')[0];
         for (let i = 1; i < N; i++) {
             innerDiv.appendChild(item.cloneNode());
         }
@@ -654,7 +648,7 @@ var preview = new function() {
      * @returns {HTMLElement} The ith slide item selector. 
      */
     this.getSlideItemSelector = function(carousel, i) {
-        let items = $(carousel).find('.' + preview.classNamePreviewCarouselNav).find('[data-slide-to]');
+        let items = $(carousel).find('.' + preview.classNamePreviewCarouselNav).find('[data-bs-slide-to]');
         if (items.length <= i) {
             throw new Error("Index out of bounds.");
         }
@@ -751,8 +745,11 @@ var preview = new function() {
      * @return {HTMLElement[]} A collection of links.
      */
     this.getReferenceLinks = function(refLinksContainer) {
-        return $(refLinksContainer)
-            .find('a').addBack('a').has('.caosdb-id').toArray();
+        var cont = $(refLinksContainer);
+        if (cont.is("a.caosdb-f-reference-value")) {
+            return cont.toArray();
+        }
+        return cont.find('a.caosdb-f-reference-value').toArray();
     }
 };
 
diff --git a/src/core/js/query_shortcuts.js b/src/core/js/query_shortcuts.js
index 426a6db4ea3b25d10e0bb6c0289caa664b34e71f..a0a7f877555dc6e2c2617892540c900be12a6a19 100644
--- a/src/core/js/query_shortcuts.js
+++ b/src/core/js/query_shortcuts.js
@@ -70,14 +70,14 @@ var query_shortcuts = new function() {
      */
     this.make_toolbox_button = function() {
         var ret = $(
-            `<div class="col-md-2 dropdown text-right caosdb-f-shortcuts-toolbox-button">
-              <button title="Shortcuts Toolbox" class="btn dropdown-toggle" type="button"
-                  data-toggle="dropdown"><span class="glyphicon glyphicon-wrench"></span></button>
+            `<div class="dropdown text-end caosdb-f-shortcuts-toolbox-button">
+              <button title="Shortcuts Toolbox" class="btn dropdown-bs-toggle" type="button"
+                  data-bs-toggle="dropdown"><i class="bi-wrench"></i></button>
               <ul class="dropdown-menu">
-                <li class="dropdown-header">Shortcuts Tools</li>
-                <li><button class="btn" type="button" data-tool="create">Create</button></li>
-                <li><button class="btn" type="button" data-tool="edit">Edit</button></li>
-                <li><button class="btn" type="button" data-tool="delete">Delete</button></li>
+                <li class="dropdown-header dropdown-item">Shortcuts Tools</li>
+                <li><button class="btn dropdown-item" type="button" data-tool="create">Create</button></li>
+                <li><button class="btn dropdown-item" type="button" data-tool="edit">Edit</button></li>
+                <li><button class="btn dropdown-item" type="button" data-tool="delete">Delete</button></li>
               </ul>
             </div>`);
 
@@ -144,12 +144,12 @@ var query_shortcuts = new function() {
 
     this.init = async function() {
         this.init_datamodel();
-        var header = $('<div class="caosdb-f-shortcuts-panel-header row h3"><span class="caosdb-f-shortcuts-panel-header-title col-md-10">Shortcuts</span></div>')
-            .append(this.make_toolbox_button());
+        var header = $('<details class="caosdb-f-shortcuts-panel-header"><summary class="caosdb-f-shortcuts-panel-header-title">Shortcuts</summary></details>')
+        header.find("summary").append(this.make_toolbox_button());
         var body = $('<div class="caosdb-f-shortcuts-panel-body"/>');
+        header.append(body)
         var shortcuts_panel = $('<div class="container caosdb-shortcuts-container"></div>')
             .append(header)
-            .append(body);
 
         body.append(await this.retrieve_global_shortcuts());
 
@@ -162,28 +162,11 @@ var query_shortcuts = new function() {
             $("#caosdb-query-panel").append(shortcuts_panel);
         }
 
-        // make toggle button
-        var toggle_button = this
-            .make_shortcuts_panel_toggle_button(shortcuts_panel);
-
-        header.find("span.caosdb-f-shortcuts-panel-header-title")
-            .prepend(toggle_button);
-
-        // initially hide panel or restore old visibility
-        if(sessionStorage[this._cache_visibility_key] !== "true") {
-            toggle_button.click();
-        }
-
         return shortcuts_panel[0];
 
     }
 
 
-    this.make_shortcuts_panel_toggle_button = function(panel) {
-        var button = $('<span title="Toggle Shortcuts Panel" class="caosdb-f-shortcuts-panel-toggle-button glyphicon glyphicon-menu-down"/>');
-        button.click((e) => this.toggle_shortcuts_panel(panel));
-        return button[0];
-    }
 
 
     /**
@@ -296,7 +279,7 @@ var query_shortcuts = new function() {
               <div class="col-md-10">
                 <span class="caosdb-f-query-shortcut-form">` + preparedstr + `</span>
               </div>
-              <div class="caosdb-f-query-shortcut-right-col col-md-2 text-right">
+              <div class="position-relative caosdb-f-query-shortcut-right-col col-md-2 text-end">
               </div>
             </div>`
         );
@@ -495,7 +478,7 @@ var query_shortcuts = new function() {
         cloned.children().show();
 
         cloned.find(".caosdb-f-query-shortcut").each((idx, item) => {
-            var wrapper = $(item).find(".col-md-2.text-right");
+            var wrapper = $(item).find(".col-md-2.text-end");
 
             // disable the inputs of the query shortcut
             $(item).find(":input").prop("disabled", true);
@@ -506,7 +489,7 @@ var query_shortcuts = new function() {
                 // user shortcut
                 // insert "UPDATE" button
                 var entity_id = $(item).attr("data-entity-id");
-                var input = $('<button type="button" class="btn btn-default" name="update-' + entity_id + '">Edit</button>')
+                var input = $('<button type="button" class="btn btn-secondary" name="update-' + entity_id + '">Edit</button>')
                     .attr("title", "Edit this shortcut.")
                     .click(() => init_update_form(panel, entity_id));
                 wrapper.append(input);
@@ -528,7 +511,7 @@ var query_shortcuts = new function() {
     this.init_cud_shortcut_form = function(panel, form) {
         // hide content
         $(panel).children().hide();
-        var query_panel = $(".caosdb-query-panel").hide();
+        var query_panel = $(".caosdb-query-form").hide();
 
         // show original again on cancel
         form.addEventListener("caosdb.form.cancel", function(e) {
@@ -538,12 +521,7 @@ var query_shortcuts = new function() {
 
         // show results in query panel
         form.addEventListener("caosdb.form.success", function(e) {
-            form.addEventListener("caosdb.form.cancel", function(e) {
-                // reset shortcuts
-                query_panel.show();
-                query_shortcuts.reset();
-            }, true);
-
+            query_panel.show();
         }, true);
 
         form.addEventListener("caosdb.form.submit", function(e) {
@@ -630,8 +608,7 @@ var query_shortcuts = new function() {
     this.make_dismissible_alert = function(type, content) {
         var ret = $(
             `<div class="alert alert-` + type + ` alert-dismissible" role="alert">
-              <button type="button" class="close" data-dismiss="alert" aria-label="Close">
-                <span aria-hidden="true">&times;</span>
+              <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close">
               </button>
             </div>`);
         ret.append(content);
@@ -669,10 +646,10 @@ var query_shortcuts = new function() {
 
 
     this.make_shortcut_buttons = function(execute, customize) {
-        const execute_button = $('<button class="btn btn-primary" type="button" title="Execute query."><span class="glyphicon glyphicon-search"></span></button>')
+        const execute_button = $('<button class="btn btn-primary" type="button" title="Execute query."><i class="bi-search"></i></button>')
             .css({"font-size": "12px"})
             .click(execute);
-        const customize_button = $('<button class="btn btn-primary" type="button" title="Write to the Query Panel for customization."><span class="glyphicon glyphicon-pencil"></span></button>')
+        const customize_button = $('<button class="btn btn-primary" type="button" title="Write to the Query Panel for customization."><i class="bi-pencil"></i></button>')
             .css({"font-size": "12px"})
             .click(customize)
             .mouseenter(function(e) {
@@ -688,26 +665,21 @@ var query_shortcuts = new function() {
                 $('#caosdb-query-textarea').attr("style", "");
             });
         const button_group = $('<div class="btn-group"/>')
-            .css({"font-size": "12px", position: "absolute", top: 0, right: "15px"})
+            .css({"font-size": "12px", position: "absolute", top: 0, right: "12px"})
             .append(customize_button, execute_button)
             .hide()
             .mouseleave(function(e) {
                 $(this).hide();
             });
 
-        const hover = $('<button class="btn btn-default caosdb-button-search"><span class="glyphicon glyphicon-search" aria-hidden="true"></span></button>')
+        const hover = $('<button class="btn btn-secondary caosdb-button-search"><i class="bi-search" aria-hidden="true"></i></button>')
             .css({"font-size": "12px"})
             .click(execute)
             .mouseenter(() => {
                 button_group.fadeIn(150);
             });
 
-        const ret = $('<span/>')
-            .css({"text-align": "right"})
-            .append(hover, button_group);
-
-        //return [hover[0], button_group[0]];
-        return ret[0];
+        return [hover[0], button_group[0]];
     }
 
     /**
@@ -734,7 +706,7 @@ var query_shortcuts = new function() {
 
         // make form fields manually, only use the form_elements to wrap it.
         cloned.find(".caosdb-f-query-shortcut").each((idx, item) => {
-            var wrapper = $(item).find(".col-md-2.text-right");
+            var wrapper = $(item).find(".col-md-2.text-end");
 
             // disable the inputs of the query shortcut
             $(item).find(":input").prop("disabled", true);
@@ -774,7 +746,7 @@ var query_shortcuts = new function() {
 
     this.make_form_entity = function(entity_id) {
         var entity = $(`
-            <div class="hidden" data-entity-role="Record">
+            <div class="invisible" data-entity-role="Record">
             </div>`);
         if(typeof entity_id === "string" || entity instanceof String) {
             entity.attr("data-entity-id", entity_id);
@@ -959,22 +931,6 @@ var query_shortcuts = new function() {
 
     this._cache_visibility_key = "caosdb.query-shortcuts-panel.visible";
 
-    this.toggle_shortcuts_panel = function(panel) {
-        var toggle_button = $(panel).find(".caosdb-f-shortcuts-panel-toggle-button")
-            .toggleClass("caosdb-f-shortcuts-panel-hidden")
-            .toggleClass("glyphicon-menu-right")
-            .toggleClass("glyphicon-menu-down");
-
-
-        // remember visibility for page reloads
-        sessionStorage[this._cache_visibility_key] = !toggle_button
-            .hasClass("caosdb-f-shortcuts-panel-hidden");
-
-        $(panel).find(".caosdb-f-shortcuts-toolbox-button").toggle();
-        $(panel).find(".caosdb-f-shortcuts-panel-body").toggle()
-    }
-
-
     // deps
     this._updateEntities = update;
     this._insertEntities = insert;
@@ -1103,12 +1059,12 @@ var query_shortcuts = new function() {
             text-align: left;
     }
 
+    .caosdb-f-query-shortcut button,
     .caosdb-f-query-shortcut div {
             min-height: 32px;
-            vertical-align: middle;
     }
 
-    div.text-right ul.dropdown-menu {
+    div.text-end ul.dropdown-menu {
         left: unset;
         right: 0;
     }
diff --git a/src/core/js/tour.js b/src/core/js/tour.js
index 398c9901393e8470ee0f31c0cfcfd2e86febbe45..b8ee39732eb0542e74ca4bced38a9203469b5aea 100644
--- a/src/core/js/tour.js
+++ b/src/core/js/tour.js
@@ -30,9 +30,10 @@
  * defines chapters, sections and pages.  Each page corresponds to a popover
  * window with some content, which can be activated by hint buttons.
  *
- * Because it is easier to write for humans, this documentation will talk about
- * a corresponding yaml file instead, which needs to be converted to a json file
- * before usage.  The `tour.yaml` shall be placed in `conf/ext/json`
+ * For the sake of simplicity, in this documentation we will talk about
+ * a corresponding yaml file (instead of json), which needs to be converted to 
+ * a json file before usage.
+ * The `tour.yaml` shall be placed in `conf/ext/json`
  * Please also consult `tour.example.yaml` stored in the `doc` folder.
  *
  * # Structure of the tour.yaml file #
@@ -73,6 +74,7 @@
  *       One of `top`, `bottom`, `left`, `right` or a combination thereof.
  * - button_size :: One of `small`, `medium`, `large`.  If not given, the button
  *       will have an automatic, not necessarily circular, size.
+ *       Currently deactivated!
  * - title :: Title of the tour page.
  * - content :: The content of the page.  Rendered as Markdown.
  * - highlighters :: Makes HTML elements of the content highlight other
@@ -92,35 +94,42 @@ var INFO = 3
 var DEBUG = 4
 var TRACE = 5
 
-var tour = new function() {
+var tour = new function () {
 
     ///////////////////////////////////////////////////////////////////////////
     //                         Improving a bit on jquery                     //
     ///////////////////////////////////////////////////////////////////////////
 
     // :Contains is case insensitive
-    jQuery.expr[':'].Contains = function(a, i, m) {
+    jQuery.expr[':'].Contains = function (a, i, m) {
         return jQuery(a).text().toUpperCase()
             .indexOf(m[3].toUpperCase()) >= 0;
     };
 
+    var logger = log.getLogger("tour");
+
     this.PageSet = class {
-        constructor(parent_set, config) {
-            if(typeof parent_set === "undefined") {
+        constructor(parent_set, config, idx) {
+            if (typeof parent_set === "undefined") {
                 throw new Error("param `parent_set` must not be undefined");
             }
-            if(typeof config === "undefined") {
+            if (typeof config === "undefined") {
                 throw new Error("param `config` must not be undefined");
             }
 
+            this.isPageSet = true;
             this.parent_set = parent_set;
             this.config = config;
             this._elements = new Array();
             this.active = false;
 
-            for (const element of config.elements) {
-                const next = tour.add_tour_element(element, this);
-                this._elements.push(next);
+            this.id = config.id || parent_set.id + "-psid-" + idx;
+
+            if (config.elements) {
+                for (const element of config.elements) {
+                    const next = tour.add_tour_element(element, this, this._elements.length);
+                    this._elements.push(next);
+                }
             }
 
             // set some defaults
@@ -138,12 +147,16 @@ var tour = new function() {
             }
         }
 
+        _tour_active () {
+            return this.parent_set._tour_active();
+        }
+
         _activate_by_id(id) {
             this.parent_set._activate_by_id(id);
         }
 
         set old_state_active(value) {
-            if(this.config.old_state_active != value) {
+            if (this.config.old_state_active != value) {
                 this.config.old_state_active = value;
                 this.update();
             }
@@ -169,20 +182,23 @@ var tour = new function() {
             return this._elements;
         }
 
+        /**
+         * Create menu entry for a PageSet
+         */
         create_menu_entry() {
-            var page_set_entry = $("<li class='list-group-item caosdb-f-tour-overview-entry caosdb-v-tour-overview-entry-pageset'/>");
-            var link = $("<a class='btn btn-link'>" + this.name + "</a>")[0];
-            this.menu_entry = link;
-            link.addEventListener("click", () => {this.activate();});
+            var menuid = 'tour-submenu-' + this.name.replace(/ /g, "");
+            var page_set_entry = $("<li class='mb-1 caosdb-f-tour-overview-entry caosdb-v-tour-overview-entry-pageset'/><button class='caosdb-v-tour-toc-pageset btn' data-bs-toggle='collapse' data-bs-target='#" + menuid + "' aria-expanded='false'>" + this.name + "</button><div id='" + menuid + "'class='collapse'><ul class='btn-toggle-nav list-unstyled fw-normal pb-1'></ul></div></li>");
+            var elements_list = page_set_entry.find("ul")[0];
+
+            // store menu_entry for highlightng opened pages/chapters.
+            this.menu_entry = page_set_entry[0];
 
-            var elements_list = $('<ul class="list-group"/>');
             for (const element of this.elements) {
                 const next = element.create_menu_entry();
-                elements_list.append(next);
+                if (next) {
+                    elements_list.append(next);
+                }
             }
-
-            page_set_entry.append(link);
-            page_set_entry.append(elements_list);
             return page_set_entry;
         }
 
@@ -191,7 +207,7 @@ var tour = new function() {
          */
         activate() {
             if (!this.active) {
-                tour.info("PageSet.activate: tour element '" + this.full_name + "'.");
+                logger.info("PageSet.activate: tour element '" + this.full_name + "'.");
 
                 this._activate();
 
@@ -207,15 +223,20 @@ var tour = new function() {
 
         highlight_menu_entry() {
             $(this.menu_entry).toggleClass("caosdb-v-tour-menu-entry-highlight", true);
+            $(this.menu_entry).find(".collapse").toggleClass("show", true);
         }
 
         unhighlight_menu_entry() {
             $(this.menu_entry).toggleClass("caosdb-v-tour-menu-entry-highlight", false);
+            $(this.menu_entry).find(".collapse").toggleClass("show", false);
         }
 
+        /**
+         * _activate PageSet
+         */
         _activate() {
             if (!this.active) {
-                tour.debug("PageSet._activate tour element '" + this.full_name + "'.");
+                logger.debug("PageSet._activate tour element '" + this.full_name + "'.");
                 this.active = true;
                 this.old_state_active = true;
                 this.highlight_menu_entry();
@@ -226,22 +247,25 @@ var tour = new function() {
             }
         }
 
+        /**
+         * _on_activation PageSet
+         */
         _on_activation() {
             let hiding = this.config.on_activation_hide;
             if (hiding) {
-                console.log("Tour page set hiding:");
+                logger.debug("Tour page set hiding:");
                 hiding = tour.assert_array(hiding);
                 hiding.forEach((selector) => {
-                    console.log(selector);
                     $(selector).addClass("caosdb-f-tour-hidden");
                 });
             }
         }
 
         deactivate_other(trigger) {
-            if(this.config.deactivate_other) {
-                for (const element of this.elements) {
-                    if(element instanceof tour.PageSet && element !== trigger) {
+            logger.debug("Close pages other than '" + trigger.id + "'.");
+            if (this.config.deactivate_other) {
+                for (const element of this._elements) {
+                    if (element.isPage && element !== trigger) {
                         element.deactivate();
                     }
                 }
@@ -251,8 +275,8 @@ var tour = new function() {
         /**
          * Initialize activation of PageSet.
          */
-        init_activation(restore_old_state=false) {
-            tour.debug("PageSet.init_activation tour element '" + this.full_name + "'.");
+        init_activation(restore_old_state = false) {
+            logger.debug("PageSet.init_activation tour element '" + this.full_name + "'.");
             if (restore_old_state) {
                 if (this.old_state_active) {
                     this.activate();
@@ -264,7 +288,7 @@ var tour = new function() {
 
         deactivate() {
             if (this.active) {
-                tour.info("PageSet.deactivate tour element '" + this.full_name + "'.");
+                logger.info("PageSet.deactivate tour element '" + this.full_name + "'.");
                 this.old_state_active = false;
                 this._deactivate();
             }
@@ -272,7 +296,7 @@ var tour = new function() {
 
         _deactivate() {
             if (this.active) {
-                tour.debug("PageSet._deactivate tour element '" + this.full_name + "'.");
+                logger.debug("PageSet._deactivate tour element '" + this.full_name + "'.");
                 this.active = false;
                 this.unhighlight_menu_entry();
 
@@ -286,57 +310,288 @@ var tour = new function() {
             }
         }
 
+        get_previous_tour_page(id) {
+            return this.parent_set.get_previous_tour_page(id);
+        }
+
+        get_next_tour_page(id) {
+            return this.parent_set.get_next_tour_page(id);
+        }
+
+        get_tour_page_by_id(id) {
+            return this.parent_set.get_tour_page_by_id(id)
+        }
+
 
     }
 
     this.Page = class {
-        constructor(parent_set, config) {
-            if(typeof parent_set === "undefined") {
+        constructor(parent_set, config, idx) {
+            if (typeof parent_set === "undefined") {
                 throw new Error("param `parent_set` must not be undefined");
             }
-            if(typeof config === "undefined") {
+            if (typeof config === "undefined") {
                 throw new Error("param `config` must not be undefined");
             }
 
-            this.active = false;
-            this.parent_set = parent_set;
             this.config = config;
-            this.button = this._create_tour_button(config.page, config.content, config.title, config.id, config.button_size, config.css);
+            this.isPage = true;
+            this.initialized = false;
 
-            this._activate_button(this.button, config.activation, config.deactivation);
-            this._position_button(this.button, config.target, config.button_position);
-            if (config.button_css) {
-                for (let key in config.button_css) {
-                    this.button.style.setProperty(key, config.button_css[key]);
-                }
+            this.parent_set = parent_set;
+            this.active = false;
+            if (typeof this.config.href === "undefined") {
+                this.config.href = "/";
+            }
+            if (typeof this.config.id === "undefined") {
+                this.config.id = (this.parent_set.id + "-p" + idx).replace(/ /g, "");
+            }
+            if (typeof this.config.show_button === "undefined") {
+                this.config.show_button = false;
+            }
+            this.id = config.id
+
+            // the argument button_size currently deactivated
+            this.button = this._create_tour_button(config.page, config.content, config.title, config.id, config.button_size, this, config.css);
+            if (!  this.config.show_button){
+                $(this.button).hide()
             }
-            this._apply_highlighters(this.button, config.highlighters);
-            this._apply_activation_links(this.button);
-            this._apply_hiding(this.button);
+            this._init_on_trigger(this.button, config);
+            this._deinit_on_trigger(this.button, config);
+
+            this._setup_activation_listeners(this.button, this.config.activation, this.config.deactivation);
 
             // set some defaults
             if (typeof this.config.active === "undefined") {
-                this.config.active = true;
+                this.config.active = false;
             }
             if (typeof this.config.old_state_active === "undefined") {
                 this.config.old_state_active = this.config.active;
             }
         }
 
+        _on_popover_open() {
+            caosdb_utils.assert_not_undefined(this.popover, "this.popover");
+            caosdb_utils.assert_not_undefined(this.popover.tip, "this.popover.tip");
+            this._scroll_into_view(this.popover.tip);
+
+            // initialize close button
+            const cb = $(this.popover.tip).find(".caosdb-f-tour-popover-close-button")
+                .on("click", (e) => {
+                    this.get_page_popover().hide();
+                });
+
+            // TODO move to styling/popover_template
+            if (this.config.detour){
+                const head = $(this.popover.tip).find(".popover-header")
+                head.toggleClass("bg-warning", true);
+            }
+
+            // initialize detour button
+            $(this.popover.tip).find('a[data-detour]').each((idx, element) => {
+                const detour_start_page_id  = $(element).data("detour");
+                const detour_page = this.get_tour_page_by_id(
+                    detour_start_page_id);
+                $(element)
+                    .attr("href", detour_page.config.href+`#${detour_start_page_id}`)
+                    .toggleClass(
+                        ["btn", "btn-sm", "btn-warning", "fw-bold"], true);
+                $(element).click((e) =>{
+                    this._activate_by_id(detour_start_page_id);
+                    const id_anchor = `#${detour_start_page_id}`;
+                    if ($(id_anchor).length > 0) {
+                        detour_page._open();
+                        return false;
+                    } else {
+                        sessionStorage["tour-page-open-next"] = detour_start_page_id;
+                        // follow link
+                    }
+                });
+            });
+
+            // initialize next/prev buttons
+            var nb = $(this.popover.tip).find("button[data-role=next]")
+            if (this.get_next()) {
+                if (this.config.force_manual_action){
+                    nb.toggleClass("disabled", true);
+                    nb.parent().attr("title","Manual action required!")
+                } else {
+                    nb.on("click", (e) => {
+                        const pn = this.get_next()
+                        pn.activate(true);
+                        if ($("#" + pn.config.id).length == 0) {
+                            sessionStorage["tour-page-open-next"] = pn.config.id;
+                            window.location = pn.config.href
+                        } else {
+                            pn._open();
+                        }
+                    });
+                }
+            } else {
+                nb.toggleClass("invisible", true);
+            }
+            var pb = $(this.popover.tip).find("button[data-role=prev]")
+            if (this.get_previous()) {
+                pb.on("click", (e) => {
+                    const pp = this.get_previous()
+                    pp.activate(true);
+                    if ($("#" + pp.config.id).length == 0) {
+                        sessionStorage["tour-page-open-next"] = pp.config.id;
+                        window.location = pp.config.href
+                    } else {
+                        pp._open();
+                    }
+                });
+            } else {
+                pb.toggleClass("invisible", true);
+            }
+        }
+
+        _init_on_trigger(button, config) {
+            const id = this.config.id;
+            // Place in the dom tree at a temporary position.
+            // This is necessary because otherwise any referencing tour
+            // page would not find this button during the initialization of
+            // the listeners.
+            $(document.body).append(button);
+            $(button).hide();
+
+            if (config.init) {
+
+                // now set up the triggering of the initialization
+                const ev = config.init["event"];
+                const always = config.init["always"]
+
+                var final_target = this._get_body_or_target(config.init["target"])
+                var call_init = () => {
+                    if (!always) {
+                        logger.debug("remove init event handler", ev, final_target);
+                        final_target.removeEventListener(ev, call_init, true);
+                    }
+                    this._init(button, config);
+                    if (this.config.init["open"]) {
+                        // open immediately
+                        sessionStorage["tour-page-open-next"] = this.config.id;
+                    }
+                    if (this.active && sessionStorage["tour-page-open-next"] == this.config.id) {
+                        if (this.config.show_button){
+                            $(this.button).show();
+                        }
+                        this._open();
+                    };
+                };
+
+                logger.debug("add init event handler", ev, call_init, final_target);
+                final_target.addEventListener(ev, call_init, true);
+
+            } else { // trigger immediately
+                this._init(button, config);
+            }
+        }
+
+        _deinit_on_trigger(button, config){
+            if (config.deinit) {
+                // now set up the triggering of the deinitialization
+                const ev = config.deinit["event"];
+
+                const final_target = this._get_body_or_target(config.deinit["target"])
+                const call_init = () => {
+                    this._deinit(button, config);
+                    $(this.button).hide();
+                    if (this.popover){
+                        this.popover.hide();
+                    }
+                };
+
+                logger.debug("add init event handler", ev, call_init, final_target);
+                final_target.addEventListener(ev, call_init, true);
+            }
+        }
+
+        /*
+         * returns the document body if target is undefined, HTMLElement of
+         * target otherwise
+         */
+        _get_body_or_target(target){
+            if (typeof target == "undefined") {
+                return document.body;
+            }
+
+            const final_target = $(target);
+            if (final_target.length < 1) {
+                throw new Error("could not find the target");
+            }
+            return final_target[0];
+        }
+
+        /**
+         * Close popover and set page to initialized=false
+         */
+        _deinit(button, config) {
+            this.initialized = false;
+        }
+
+        /**
+         * Intialize the button and the popover of this page.
+         *
+         * This means positioning it on the page, adding all necessary event
+         * listeners, and more.
+         **/
+        _init(button, config) {
+            logger.trace("enter Page._init", this.id, button, config);
+            this._position_button(button, config.target, config.button_position);
+            if (config.button_css) {
+                for (let key in config.button_css) {
+                    button.style.setProperty(key,
+                        config.button_css[key]);
+                }
+            }
+            this._apply_highlighters(button, config.highlighters);
+            this._apply_hiding(button);
+            this.initialized = true;
+        }
+
         _activate_by_id(id) {
             this.parent_set._activate_by_id(id);
         }
 
+        /** create_menu_enrty for a Page */
         create_menu_entry() {
-            var entry = $("<li class='list-group-item caosdb-f-tour-overview-entry caosdb-v-tour-overview-entry-page' />");
-            var link = $("<a class='btn btn-link'>" + this.name + "</a>")[0];
-            link.addEventListener("click", () => {this.activate();});
+            const id_anchor = `#${this.config.id}`;
+
+            if (this.config.do_not_show_in_toc) {
+                return;
+            }
+            var classes = ""
+            if (this.config.detour){
+                classes = " caosdb-v-tour-toc-detour"
+            }
+            if (sessionStorage["tour-page-open-cur"] == this.config.id) {
+                classes = classes + " caosdb-v-tour-toc-cur";
+            }
+            var entry = $("<li class='caosdb-f-tour-overview-entry caosdb-v-tour-overview-entry-page" + classes + "' />");
+            var link = $("<a href='" + this.config.href + id_anchor + "'>" + this.name + "</a>")[0];
+
+            $(link).click((e) => {
+                this.activate(true);
+
+                if ($(id_anchor).length > 0) {
+                    this._open();
+                    return false;
+                } else {
+                    sessionStorage["tour-page-open-next"] = this.config.id;
+                    // follow link
+                }
+
+            });
             entry.append(link);
+
+            this.menu_entry = entry[0];
             return entry[0];
         }
 
         set old_state_active(value) {
-            if(this.config.old_state_active != value) {
+            if (this.config.old_state_active != value) {
                 this.config.old_state_active = value;
                 this.update();
             }
@@ -358,33 +613,194 @@ var tour = new function() {
             return this.parent_set.full_name + ":" + this.name;
         }
 
-        init_activation(restore_old_state=false) {
-            tour.debug("Page.init_activation button '" + this.full_name + "'.");
+        /*
+         * Page init_activation
+         */
+        init_activation(restore_old_state = false) {
+            logger.debug("Page.init_activation button '" + this.full_name + "'.");
             if (restore_old_state) {
                 if (this.old_state_active) {
-                    this.activate();
+                    this.activate(false);
                 }
             } else if (this.config.active) {
-                this.activate();
+                this.activate(false);
             }
         }
 
-        activate() {
+        _highlight_menu() {
+            $(".caosdb-v-tour-toc-active-item").toggleClass("caosdb-v-tour-toc-active-item", false);
+            $(".caosdb-v-tour-toc-cur").toggleClass("caosdb-v-tour-toc-cur", false);
+            $(this.menu_entry).toggleClass("caosdb-v-tour-toc-active-item", true);
+        }
+
+        _unhighlight_menu() {
+            $(this.menu_entry).toggleClass("caosdb-v-tour-toc-active-item", false);
+        }
+
+        _close_other() {
+            // hide all other popover, close all other tour pages.
+            const tour_inst = this.parent_set.parent_set
+            for (var index in tour_inst._elements_by_id ){
+                const page = tour_inst._elements_by_id[index]
+                if (page.popover){
+                    page.popover.hide();
+                }
+                if (page.button){
+                    // TODO close only when f-tour-open-page class is there?
+                    $(page.button).toggleClass("caosdb-f-tour-open-page", false)
+                    page.button.dispatchEvent(tour.close_page_event);
+                }
+            }
+        }
+
+        get_page_popover() {
+            const target = $(this.config["target"])[0]
+            if (!this.popover) {
+                // not initialized yet.
+                this.popover = new bootstrap.Popover(target, this.popover_options);
+
+                const events = [
+                  "ext_bottom_line.preview.ready",
+                  "caosdb.preview.ready",
+                  "caosdb.preview.show",
+                  "caosdb.preview.hide",
+                  "shown.bs.collapse",
+                  "hidden.bs.collapse",
+                ];
+                for (let ev of events) {
+                    document.body.addEventListener(ev, () => {
+                        this.popover.update();
+                    }, true);
+                }
+                target.addEventListener("shown.bs.popover", (e) => {
+                    if (this.active){
+                        this._on_popover_open();
+                        this.button.dispatchEvent(tour.open_page_event);
+                    }
+
+                });
+                target.addEventListener("hidden.bs.popover", (e) => {
+                    $(this.button).toggleClass("caosdb-f-tour-open-page", false)
+                });
+
+            }
+            return this.popover;
+        }
+
+        _before_open() {
+            if (this.config["before_open"]) {
+                const f = new Function(this.config["before_open"]);
+                f();
+            }
+        }
+
+        _open() {
+            this._before_open();
+            const button = $(this.button);
+            const target = $(this.config["target"])
+            sessionStorage["tour-page-open-cur"] = this.config.id;
+            if (button.is(".caosdb-f-tour-open-page")) {
+                return; // already open
+            }
+            if (! target[0]) {
+                return; // element to attach to not available; can't open
+            }
+            if (this.get_next()) {
+                if ($(`#${this.get_next().config.id}`).length == 0) {
+                    logger.debug(`Set next page in session store to `, this.get_next().config.id);
+                    sessionStorage["tour-page-open-next"] = this.get_next().config.id
+                }
+            }
+            target.on('hidden.bs.popover', (e) => {
+                button[0].dispatchEvent(tour.close_page_event);
+            });
+            this._close_other();
+
+            // open this one
+            const popover = this.get_page_popover();
+            button.toggleClass("caosdb-f-tour-open-page", true);
+            popover.show();
+
+            this._highlight_menu();
+        }
+
+        _scroll_into_view(popover) {
+            if (typeof popover == "undefined") {
+                return;
+            }
+            const box = popover.getBoundingClientRect();
+            const viewport_height = window.innerHeight || document.documentElement.clientHeight;
+            var yscroll = 0;
+
+            if (box.bottom > viewport_height) {
+                // element's bottom is hidden down there
+                // align top of popover with top of viewport or bottom of
+                // popover with bottom of viewport, whichever involves the
+                // least scrolling.
+                yscroll = box.bottom - viewport_height;
+            }
+
+            if (box.top < yscroll) {
+                // element's top is hidden up there
+                // align top of popover with top of viewport
+                yscroll += box.top
+            }
+
+            window.scrollBy(0, yscroll);
+        }
+
+        _close() {
+            logger.debug(`Page.close ${this.config.id}`);
+            $(this.button)
+                .toggleClass("caosdb-f-tour-open-page", false)
+            if (this.popover) {
+                this.popover.hide();
+            }
+            this._unhighlight_menu();
+        }
+
+        /*
+         * Page activate
+         */
+        activate(deactivate_others) {
+            if (deactivate_others) {
+                this.parent_set.deactivate_other(this)
+            }
             if (!this.active) {
-                tour.info("Page.activate button '" + this.full_name + "'.");
+                logger.info("Page.activate button '" + this.full_name + "'.");
                 this.old_state_active = true;
                 this.active = true;
 
+                // TODO Why is the following line necessary? "References"
+                // Chapter of files does not open without it (when the
+                // "References" is used to get to the correct page)
+                if (this.config.show_button){
+                    $(this.button).show();
+                }
+
                 // activation propagates to the parents
                 this.parent_set._activate()
 
+                if (this.initialized && sessionStorage["tour-page-open-next"] == this.config.id) {
+                    if ($(this.config["target"])[0]) {
+                        this._open();
+                    } else {
+                        tour._post_init_cb.push(() => {
+                            this._open();
+                        });
+                    }
+                }
+                // Set the natural "next" as next tour page in session store as
+                // default. This value will be overwritten by navigation.
+            }
+            if (this.config.show_button){
                 $(this.button).show();
             }
         }
 
         deactivate() {
             if (this.active) {
-                tour.info("Page.deactivate button '" + this.full_name + "'.");
+                logger.info("Page.deactivate button '" + this.full_name + "'.");
                 this.old_state_active = false;
 
                 this._deactivate();
@@ -394,47 +810,63 @@ var tour = new function() {
 
         _deactivate() {
             if (this.active) {
-                tour.debug("Page._deactivate button '" + this.full_name + "'.");
+                logger.debug("Page._deactivate button '" + this.full_name + "'.");
                 this.active = false;
+                this._close();
                 $(this.button).hide();
-                $(this.button).popover("hide");
                 $(this.button).toggleClass("caosdb-f-tour-open-page", false);
             }
         }
 
+        _tour_active () {
+            return this.parent_set._tour_active();
+        }
+
         /**
          * Hook the button to (de)activation events.
          */
-        _activate_button(button, activation, deactivation) {
-            $(button).hide();
+        _setup_activation_listeners(button, activation, deactivation) {
+            //$(button).hide();
             if (typeof activation !== "undefined") {
                 activation = tour.assert_array(activation);
                 activation.forEach(
                     (act) => {
-                        if (act === null) { return; }
+                        if (act === null) {
+                            return;
+                        }
                         tour._post_init_cb.push(() => {
                             var target = $(act.target)[0];
                             if (target) {
+                                logger.debug("Added listener:", target, act.event)
                                 target.addEventListener(
                                     act.event,
-                                    (e) => {this.activate();}
+                                    (e) => {
+                                        if (this._tour_active()) {
+                                            logger.debug("Activate", this.config.id, "due to ", act.event)
+                                            this.activate();
+                                        }
+                                    }
                                 );
                             }
                         });
                     }
                 )
             }
-            if (typeof deactivation !== "undefined" ) {
+            if (typeof deactivation !== "undefined") {
                 deactivation = tour.assert_array(deactivation);
                 deactivation.forEach(
                     (deact) => {
-                        if (deact === null) { return; }
+                        if (deact === null) {
+                            return;
+                        }
                         tour._post_init_cb.push(() => {
                             var target = $(deact.target)[0];
                             if (target) {
                                 target.addEventListener(
                                     deact.event,
-                                    (e) => {this.deactivate();}
+                                    (e) => {
+                                        this.deactivate();
+                                    }
                                 );
                             }
                         });
@@ -446,8 +878,9 @@ var tour = new function() {
 
         _position_button(button, target, position) {
             var sel = $(target).first()
-            if (typeof sel.css("position") === "undefined"
-                || sel.css("position") === "static") {
+            logger.debug("positioning button", button, target, sel, position);
+            if (typeof sel.css("position") === "undefined" ||
+                sel.css("position") === "static") {
                 sel.css("position", "relative");
             }
 
@@ -457,111 +890,118 @@ var tour = new function() {
             $(button).css("position", "absolute");
 
             switch (position) {
-                case "top":
-                    sel.prepend(wrapper);
-                    $(button).css("top", - Math.abs($(button).outerHeight()) / 2);
-                    //$(button).css("left", "50%");
-                    break;
-                case "top-right":
-                    sel.prepend(wrapper);
-                    $(button).css("top", - Math.abs($(button).outerHeight()) / 2);
-                    $(button).css("right", - Math.abs($(button).outerWidth()) / 2);
-                    break;
-                case "right":
-                    wrapper.css("top", "50%");
-                    wrapper.css("right", sel.css("padding-right"));
-                    wrapper.css("position", "absolute");
-                    sel.prepend(wrapper);
-                    $(button).css("right", - Math.abs($(button).outerWidth()) / 2);
-                    $(button).css("top", - Math.abs($(button).outerHeight()) / 2);
-                    break;
-                case "bottom-right":
-                    sel.append(wrapper);
-                    $(button).css("bottom", - Math.abs($(button).outerHeight()) / 2);
-                    $(button).css("right", - Math.abs($(button).outerWidth()) / 2);
-                    break;
-                case "bottom":
-                    wrapper.css("top", "100%");
-                    wrapper.css("left", "50%");
-                    wrapper.css("position", "absolute");
-                    sel.append(wrapper);
-                    $(button).css("margin-top", "5px");
-                    $(button).css("top", 0);
-                    $(button).css("left", 0);
-                    $(button).css("transform", "translate(-50%, 0)");
-                    break;
-                case "bottom-left":
-                    sel.append(wrapper);
-                    $(button).css("bottom", - Math.abs($(button).outerHeight()) / 2);
-                    $(button).css("left", - Math.abs($(button).outerWidth()) / 2);
-                    break;
-                case "left":
-                    wrapper.css("top", "50%");
-                    wrapper.css("position", "absolute");
-                    sel.prepend(wrapper);
-                    $(button).css("margin-right", "5px");
-                    $(button).css("top", 0);
-                    $(button).css("right", 0);
-                    $(button).css("transform", "translate(0, -50%)");
-                    break;
-                default:
-                    // top-left
-                    sel.prepend(wrapper);
-                    $(button).css("top", - Math.abs($(button).outerHeight()) / 2);
-                    $(button).css("left", - Math.abs($(button).outerWidth()) / 2);
-                    break;
+            case "top":
+                sel.prepend(wrapper);
+                $(button).css("top", -Math.abs($(button).outerHeight()) / 2);
+                //$(button).css("left", "50%");
+                break;
+            case "top-right":
+                sel.prepend(wrapper);
+                $(button).css("top", -Math.abs($(button).outerHeight()) / 2);
+                $(button).css("right", -Math.abs($(button).outerWidth()) / 2);
+                break;
+            case "right":
+                wrapper.css("top", "50%");
+                wrapper.css("right", sel.css("padding-right"));
+                wrapper.css("position", "absolute");
+                sel.prepend(wrapper);
+                $(button).css("right", -Math.abs($(button).outerWidth()) / 2);
+                $(button).css("top", -Math.abs($(button).outerHeight()) / 2);
+                break;
+            case "bottom-right":
+                sel.append(wrapper);
+                $(button).css("bottom", -Math.abs($(button).outerHeight()) / 2);
+                $(button).css("right", -Math.abs($(button).outerWidth()) / 2);
+                break;
+            case "bottom":
+                wrapper.css("top", "100%");
+                wrapper.css("left", "50%");
+                wrapper.css("position", "absolute");
+                sel.append(wrapper);
+                $(button).css("margin-top", "5px");
+                $(button).css("top", 0);
+                $(button).css("left", 0);
+                $(button).css("transform", "translate(-50%, 0)");
+                break;
+            case "bottom-left":
+                sel.append(wrapper);
+                $(button).css("bottom", -Math.abs($(button).outerHeight()) / 2);
+                $(button).css("left", -Math.abs($(button).outerWidth()) / 2);
+                break;
+            case "left":
+                wrapper.css("top", "50%");
+                wrapper.css("position", "absolute");
+                sel.prepend(wrapper);
+                $(button).css("margin-right", "5px");
+                $(button).css("top", 0);
+                $(button).css("right", 0);
+                $(button).css("transform", "translate(0, -50%)");
+                break;
+            default:
+                // top-left
+                sel.prepend(wrapper);
+                $(button).css("top", -Math.abs($(button).outerHeight()) / 2);
+                $(button).css("left", -Math.abs($(button).outerWidth()) / 2);
+                break;
             }
 
+            // initially hide the button
+            $(button).hide();
         }
 
 
         _apply_highlighter(highlighter, highlightable) {
             $(highlighter).hover(
-                ()=>{
+                () => {
                     highlightable.toggleClass("caosdb-v-tour-highlight", true);
                 },
-                ()=>{
+                () => {
                     highlightable.toggleClass("caosdb-v-tour-highlight", false);
                 }
             );
         }
 
-        /**
-         * Hook click events for `data-tour-activate` <a> elements.
-         */
-        _apply_activation_links(button) {
-            $(button).on('shown.bs.popover', (e) => {
-                $('a[data-tour-activate]').each((idx, element) => {
-                    element.addEventListener("click", () => {
-                        this._activate_by_id($(element).data("tour-activate"));
-                    });
-                });
-            });
-        }
-
         _apply_hiding(button) {
             $(button).on('shown.bs.popover', (e) => {
                 let hiding = this.config.on_activation_hide;
                 if (hiding) {
-                    console.log("Tour page hiding:");
+                    logger.debug("Tour page hiding:");
                     hiding = tour.assert_array(hiding);
                     hiding.forEach((selector) => {
-                        console.log(selector);
                         $(selector).addClass("caosdb-f-tour-hidden");
                     });
                 }
                 let unhiding = this.config.on_activation_unhide;
                 if (unhiding) {
-                    console.log("Tour page unhiding:");
+                    logger.debug("Tour page unhiding:");
                     unhiding = tour.assert_array(unhiding);
                     unhiding.forEach((selector) => {
-                        console.log(selector);
                         $(selector).removeClass("caosdb-f-tour-hidden");
                     });
                 }
             })
         }
 
+        get_previous() {
+            if (this.config.previous){
+                return this.parent_set.parent_set._elements_by_id[this.config.previous];
+            } else {
+                return this.parent_set.get_previous_tour_page(this.id);
+            }
+        }
+
+        get_next() {
+            if (this.config.next){
+                return this.parent_set.parent_set._elements_by_id[this.config.next];
+            } else {
+                return this.parent_set.get_next_tour_page(this.id);
+            }
+        }
+
+        get_tour_page_by_id(id) {
+            return this.parent_set.get_tour_page_by_id(id)
+        }
+
         _apply_highlighters(button, highlighters) {
             if (typeof button === "undefined") {
                 throw new Error("button was undefined");
@@ -581,17 +1021,18 @@ var tour = new function() {
                     this._apply_highlighter(button, highlightable[id]);
                 } else {
                     $(button).on('shown.bs.popover', (e) => {
-                        console.log("Highlighting:")
-                        console.log(highlighters[id]);
-                        console.log(highlightable[id]);
+                        // TODO check if this popover is already initialized
+                        logger.debug("Highlighting:",
+                            highlighters[id], highlightable[id]);
                         this._apply_highlighter("#" + id, highlightable[id]);
                     });
                 }
             }
         }
 
-        _create_tour_button(name, content, title, id, size, css={},
-                            placement="auto") {
+        // currently deactivated
+        _create_tour_button(name, content, title, id, size, page, css = {},
+            placement = "auto") {
             if (typeof name === "undefined") {
                 throw new Error("name was undefined");
             }
@@ -599,10 +1040,10 @@ var tour = new function() {
                 throw new Error("content was undefined");
             }
 
-            var button = $('<button class="caosdb-v-tour-button">' + name + '</button>');
+            var button = $('<button class="caosdb-v-tour-button"></button>');
 
             var markdown_content = tour.markdown_to_html(content);
-            tour.debug(markdown_content);
+            //logger.debug("Page's markdown content: ", markdown_content);
 
             // Apply custom style immediately at popover creation.
             // Alternatively, we could create a custom style element which sets
@@ -612,76 +1053,75 @@ var tour = new function() {
                 css["max-width"] = "120em";
             }
             if (!("width" in css)) {
-                css["width"] = "50em";
+                css["width"] = "30em";
             }
-            // console.log(css)
             let popover_style = "";
             for (let key in css) {
                 popover_style += key + ": " + css[key] + "; ";
             }
-            // Bootstrap 3.x: .popover-content, 4.x: .popover-body
-            let popover_template = '<div class="popover" role="tooltip" style="'
-                + popover_style
-                + '"><div class="arrow"></div><h3 class="popover-header"></h3>'
-                + '<div class="popover-body popover-content"></div></div>';
+            let popover_template = '<div class="popover" role="tooltip" style="z-index:20000; ' +
+                popover_style +
+                '"><div class="popover-arrow"></div><button class="btn btn-close caosdb-f-tour-popover-close-button caosdb-v-tour-popover-close-button"></button><h3 class="popover-header"></h3><div class="popover-body popover-content"></div><div class="p-3 pt-0 d-flex justify-content-between" ><span><button class="btn btn-sm btn-secondary caosdb-v-tour-pn-btn me-auto" data-role="prev">Previous</button></span><span><button class="btn btn-sm btn-secondary caosdb-v-tour-pn-btn" data-role="next">Next</button></span></div></div>';
 
-            button.popover({
+            button.attr("title", title);
+
+            if (typeof title === "undefined") {
+                title = ""
+            };
+            this.popover_options = {
                 title: title,
                 content: markdown_content,
+                container: "body",
                 placement: placement,
                 html: true,
                 sanitize: false,
                 trigger: 'manual',
                 template: popover_template,
-            });
+            };
 
-            button.on("click", function(e) {
-                if($(this).hasClass("caosdb-f-tour-open-page")) {
-                    this.dispatchEvent(tour.close_page_event);
+            button.on("click", (e) => {
+                if (button.hasClass("caosdb-f-tour-open-page")) {
+                    this._close();
                 } else {
-                    this.dispatchEvent(tour.open_page_event);
+                    this._open();
                 }
-                $(this).toggleClass("caosdb-f-tour-open-page");
 
                 // clicks on the tour button should not trigger any other action
                 e.preventDefault();
                 e.stopPropagation();
             });
 
-            button[0].addEventListener("close.tour.page", function() {
-                button.popover("hide");
-            });
-
-            button[0].addEventListener("open.tour.page", function() {
-                var p_id = button.popover("show")[0].getAttribute("aria-describedby");
-                var popover = $("#" + p_id);
-
-                // hide all other popovers
-                $(".caosdb-v-tour-button").each(function(index) {
-                    if (this != button[0]) {
-                        $(this).popover("hide");
-                    }
-                });
-            });
 
-            if(id) {
+            if (id) {
                 button.attr("id", id);
             }
+            /* currently deactivated
             if(size)
                 $(button).toggleClass(size, true);
 
+            */
             return button[0];
         }
 
     }
 
     this.config = undefined;
+    this.popover_options = {};
     this.close_page_event = new Event("close.tour.page");
     this.open_page_event = new Event("open.tour.page");
 
     this._post_init_cb = []
 
-    this.post_init = function() {
+    /**
+     * Post init is called after the initialization.
+     *
+     * It is mainly used to initialize event listeners which needed to wait
+     * until all the tour buttons are actually present in the DOC tree.
+     *
+     * All functions which need to be called after the intialization of the
+     * tour may be appended to the {@link tour#_post_init_cb} array.
+     */
+    this.post_init = function () {
         for (const fn of this._post_init_cb) {
             fn();
         }
@@ -700,13 +1140,14 @@ var tour = new function() {
     /**
      * Initialize the tour.
      *
-     * The `refresh` argument is currently only used interactively on the debugging console.
+     * The `refresh` argument is currently only used interactively on the
+     * debugging console.
      */
     this.init = async function _in(refresh) {
         try {
-            tour.debug("initializing tour module, refresh: " + refresh);
+            logger.debug("initializing tour module, refresh: " + refresh);
             if (refresh === true) {
-                tour.info("Refreshing tour state.");
+                logger.info("Refreshing tour state.");
                 localStorage.removeItem("tour_state");
             }
             await tour.load_tour();
@@ -721,61 +1162,80 @@ var tour = new function() {
         try {
             var old_state = JSON.parse(localStorage.getItem("tour_state"));
             if (old_state) {
-                config = {tour: old_state}
+                config = {
+                    tour: old_state
+                }
             };
         } catch (error) {
             if (error instanceof SyntaxError) {
-                tour.warning("Parsing old tour state failed with SyntaxError. Old tour state: '" + localStorage.getItem("tour_state") + "'.");
+                logger.warning("Parsing old tour state failed with SyntaxError. Old tour state: '" + localStorage.getItem("tour_state") + "'.");
             } else {
                 globalError(error);
             }
         }
-        if(!config || config.length == 0 || config.tour.length == 0) {
-            tour.info("No old tour state in the localStorage.");
+
+        // reset if build number changed
+        if (config && config.tour && config.tour._build_number != "${BUILD_NUMBER}") {
+            config = undefined;
+        }
+        if (!config || config.length == 0 || config.tour.length == 0) {
+            logger.info("No old tour state in the localStorage.");
             // try to fetch 
             config = await load_config("tour.json");
-            console.log("Loaded tour.json:");
-            console.log(config);
+            logger.debug("Loaded tour.json", config);
         }
         if (!config || config.length == 0 || config.tour.length == 0) {
             localStorage.setItem("tour_state", "[]");
-            tour.info("Tour config is empty.");
+            logger.info("Tour config is empty.");
             return;
         }
 
+        // store build number in tour config
+        config.tour._build_number = "${BUILD_NUMBER}";
         tour.configure(config.tour);
     }
 
-
-
-
-    this.add_tour_element = function(element, parent_set) {
+    this.add_tour_element = function (element, parent_set, idx) {
         if (element.page_set) {
             // it's a page_set
-            return tour.add_tour_page_set(element, parent_set);
+            return tour.add_tour_page_set(element, parent_set, idx);
+        } else if (typeof element.separator != "undefined") {
+            // it's a separator
+            return tour.add_tour_menu_separator();
         } else {
             // it's a page
-            return tour.add_tour_page(element, parent_set);
+            return tour.add_tour_page(element, parent_set, idx);
         }
     }
 
+    this.add_tour_page_set = function (config, parent_set, idx) {
+        return new tour.PageSet(parent_set, config, idx);
+    }
 
-    this.add_tour_page_set = function(config, parent_set) {
-        return new tour.PageSet(parent_set, config);
+    this.add_tour_menu_separator = function (element) {
+        return {
+            create_menu_entry: () => $("<hr>")[0],
+            init_activation: function() {},
+            _deactivate: function() {},
+        }
     }
 
     this.Tour = class {
         constructor(config) {
             this.full_name = "Tour";
+            this.id = config.id || "tour0";
             this.config = config;
             this.elements = new Array();
-            this.leave_tour_button = $('<a class="btn btn-link">Leave Tour</a>');
-            this.leave_tour_button.hide();
-            this.reset_tour_button = $('<a class="btn btn-link">Reset Tour</a>');
-            this.reset_tour_button.hide();
             this.active = false;
+
+            var menuitem = $('<li class="nav-item" id="caosdb-navbar-tour"><a href="#" class="d-none nav-link caosdb-f-start-tour-btn" title="Start a Tour">Tour</a><a href="#" title="Leave the Tour" class="d-none caosdb-f-leave-tour-btn nav-link">Tour</a></li>')
+            $(".caosdb-navbar").append(menuitem);
+
+            var min_width_warning = $('<div class="alert alert-warning caosdb-tour-min-width-warning d-lg-none" role="alert"><strong>Warning</strong> This tour is optimized for screens wider than 992px. If you have trouble displaying elements of this tour, please try accessing it on a larger screen.</div>');
+            $(".navbar").append(min_width_warning);
+
             for (const element of this.config.elements) {
-                const next = tour.add_tour_element(element, this);
+                const next = tour.add_tour_element(element, this, this.elements.length);
                 this.elements.push(next);
             }
 
@@ -791,37 +1251,96 @@ var tour = new function() {
                 this.config.deactivate_other = true;
             }
 
+            $(".caosdb-f-leave-tour-btn").click((e) => {
+                this.deactivate();
+            });
+            $(".caosdb-f-start-tour-btn").click((e) => {
+                this.activate();
+            });
+
             this.update();
-            this.panel = this.create_tour_overview_panel();
-            this.init_activation(this.config.persistent_state);
+            this.create_tour_overview_panel();
 
             this._elements_by_id = {};
-            this._index_elements(this._elements_by_id, this);
+            this._tour_pages = [];
+            this._index_elements(this._elements_by_id, this._tour_pages, this);
+            this._toggle_tour_buttons();
+            this._toggle_width_warning();
+        }
+
+        _toggle_tour_buttons() {
+            $(".caosdb-f-leave-tour-btn").toggleClass("d-none", !this.active);
+            $(".caosdb-f-start-tour-btn").toggleClass("d-none", this.active);
+        }
+
+        _toggle_width_warning() {
+            $(".caosdb-tour-min-width-warning").toggleClass("d-block", this.active);
+            $(".caosdb-tour-min-width-warning").toggleClass("d-none", !this.active);
+        }
+
+        _tour_active () {
+            return this.active;
+        }
+
+        /**
+         * @param {string} id
+         * @return {tour.Page}
+         */
+        get_next_tour_page(id) {
+            const index_old = this._tour_pages.indexOf(id);
+            if (index_old < 0) {
+                throw new Error("Tour page not in _tour_pages list");
+            }
+            const index_new = index_old + 1;
+            if (index_new >= this._tour_pages.length) {
+                return null;
+            }
+            return this._elements_by_id[this._tour_pages[index_new]];
+        }
 
+        get_tour_page_by_id(id) {
+            return this._elements_by_id[id];
         }
 
+        /**
+         * @param {string} id
+         * @return {tour.Page}
+         */
+        get_previous_tour_page(id) {
+            const index_old = this._tour_pages.indexOf(id);
+            if (index_old < 0) {
+                throw new Error("Tour page not in _tour_pages list");
+            }
+            const index_new = index_old - 1;
+            if (index_new < 0) {
+                return null;
+            }
+            return this._elements_by_id[this._tour_pages[index_new]];
+        }
 
-        _index_elements(index, element) {
-            if(element.elements) {
+        _index_elements(index, pages, element) {
+            if (element.elements) {
                 for (const sub of element.elements) {
-                    this._index_elements(index, sub);
-                    if (sub.config.id) {
-                        index[sub.config.id] = sub;
+                    this._index_elements(index, pages, sub);
+                    if (sub.id) {
+                        index[sub.id] = sub;
+                    }
+                    if (sub.isPage) {
+                        pages.push(sub.id);
                     }
                 }
             }
         }
 
-
         _activate_by_id(id) {
             var element = this._elements_by_id[id];
             if (element) {
-                element.activate();
+                element.activate(true);
             }
         }
 
         set old_state_active(value) {
-            if(this.config.old_state_active != value) {
+            if (this.config.old_state_active != value) {
                 this.config.old_state_active = value;
                 this.update();
             }
@@ -834,8 +1353,8 @@ var tour = new function() {
         /**
          * Start tour activation.
          */
-        init_activation(restore_old_state=false) {
-            tour.debug("Tour.init_activation '" + this.full_name + "'.");
+        init_activation(restore_old_state = false) {
+            logger.debug("Tour.init_activation '" + this.full_name + "'.");
             if (restore_old_state) {
                 if (this.old_state_active) {
                     this.activate();
@@ -846,55 +1365,63 @@ var tour = new function() {
         }
 
         deactivate() {
-            tour.info("Tour.deactivate tour");
+            logger.info("Tour.deactivate tour");
             this._deactivate();
 
             // deactivation propagates to the children
             for (const element of this.elements) {
                 element._deactivate();
             }
+
+            sessionStorage.removeItem("tour-page-open-next")
         }
 
         /**
          * Reset the tour state.  Mainly useful for development and debugging.
          */
         async reset_tour() {
-            // console.log("Resetting the tour");
+            logger.info("Resetting the tour");
+            sessionStorage.removeItem("tour-page-open-next")
             this.deactivate();
             localStorage.removeItem("tour_state");
             var config = await load_config("tour.json")
             if (!config || config.length == 0 || config.tour.length == 0) {
                 localStorage.setItem("tour_state", "[]");
-                tour.info("Tour config is empty.");
+                logger.info("Tour config is empty.");
             } else {
                 tour.configure(config.tour);
             }
-            // A bit ugly, but the reset button will be removed or completely
-            // changed for production anyways.
             location.reload();
         }
 
         _deactivate() {
-            if(this.active) {
-                this.set_tour_button_text("Start A Tour");
-                tour.debug("Tour._deactivate tour");
+            if (this.active) {
+                logger.debug("Tour._deactivate tour");
                 this.old_state_active = false;
                 this.active = false;
-                this.leave_tour_button.hide();
-                this.reset_tour_button.hide();
+                this._hide_tour_sidebar();
+                this._toggle_tour_buttons();
+                this._toggle_width_warning();
                 this.update();
             }
         }
 
+        _hide_tour_sidebar() {
+            $("body").toggleClass("tour-sidebar-visible", false);
+        }
+
+        _show_tour_sidebar() {
+            $("body").toggleClass("tour-sidebar-visible", true);
+        }
 
         _activate() {
-            if(!this.active) {
-                this.set_tour_button_text("Tour");
-                tour.debug("Tour._activate tour");
+            if (!this.active) {
+                logger.debug("Tour._activate tour");
                 this.old_state_active = true;
                 this.active = true;
-                this.leave_tour_button.show();
-                this.reset_tour_button.show();
+                this._show_tour_sidebar();
+                this._toggle_tour_buttons();
+                this._toggle_width_warning();
                 this.update();
             }
         }
@@ -903,7 +1430,7 @@ var tour = new function() {
          * Activate tour: initialize activation of elements.
          */
         activate() {
-            tour.info("Tour.activate tour");
+            logger.info("Tour.activate tour");
             this._activate();
 
             for (const element of this.elements) {
@@ -913,36 +1440,25 @@ var tour = new function() {
         }
 
         deactivate_other(trigger) {
-            if(this.config.deactivate_other) {
+            if (this.config.deactivate_other) {
+                logger.debug("Close pagesets other than '" + trigger.id + "'.");
                 for (const element of this.elements) {
-                    if(element instanceof tour.PageSet && element !== trigger) {
+                    if (element.isPageSet && element !== trigger) {
                         element.deactivate();
                     }
                 }
             }
         }
 
-        set_tour_button_text(text) {
-            $("button.caosdb-f-tour-button").text(text);
-        }
-
-
         create_tour_overview_panel() {
-            var panel = $('<div class="collapse" id="caosdb-f-tour-overview-panel" /></div>');
-            var tour_overview = $('<ul class="list-inline caosdb-v-tour-overview"/>');
+            var tour_overview = $('<ul class="list-unstyled caosdb-v-tour-overview"/>');
             for (const element of this.elements) {
                 const next = element.create_menu_entry();
-                tour_overview.append(next);
+                if (next) {
+                    tour_overview.append(next);
+                }
             }
-
-            panel.append(tour_overview);
-
-            this.leave_tour_button.on("click", () => {this.deactivate();});
-            this.reset_tour_button.on("click", () => {this.reset_tour();});
-            panel.append(this.leave_tour_button);
-            panel.append(this.reset_tour_button);
-            return panel[0];
-
+            $("#tour-toc .caosdb-f-tour-toc-body").empty().append(tour_overview);
         }
 
         update() {
@@ -952,90 +1468,55 @@ var tour = new function() {
 
     }
 
-    this.configure = function(config) {
-        tour.info({"configure tour": config});
+    this.configure = function (config) {
+        logger.info({
+            "configure tour": config
+        });
 
         // clean up old tour elements (after reload)
         $("#caosdb-f-tour-overview-panel").remove();
         $("#caosdb-navbar-tour").remove();
         $(".caosdb-f-tour-button-wrapper").remove();
 
-        // new stuff following
-        var tour_button = $(`
-<li id="caosdb-navbar-tour">
-  <button class="navbar-btn btn btn-link caosdb-f-tour-button" data-toggle="collapse" data-target="#caosdb-f-tour-overview-panel">
-    Start A Tour
-  </button>
-</li>`);
-        $('.caosdb-navbar').append(tour_button[0]);
-        tour._instance = new tour.Tour(config);
+        // TODO how can this be done better?
+        $("#caosdb-navbar-tour>a").each(function (index) {
+            this.addEventListener("click", () => {
+                $(".caosdb-v-left-panel").toggleClass("invisible");
+            });
+        })
+        const instance = new tour.Tour(config);
 
         if (config.reload) {
-            $(config.reload.target).each(function(index) {
-                this.addEventListener(config.reload.event, (e) => {tour.configure(tour._instance.config);}, true);
+            $(config.reload.target).each(function (index) {
+                this.addEventListener(config.reload.event, (e) => {
+                    tour.configure(instance.config);
+                }, true);
             });
         }
 
-        if(tour._instance.active) {
-            tour._instance.set_tour_button_text("Tour");
+        if (typeof sessionStorage["tour-page-open-next"] === "undefined") {
+            const next = sessionStorage["tour-page-open-cur"] || instance._tour_pages[0];
+            sessionStorage["tour-page-open-next"] = next
         }
-        $('#caosdb-query-panel').before(tour._instance.panel);
-        // hide, when the mouse leaves the navbar
-        $('nav.navbar').hover(undefined, ()=>{$(tour._instance.panel).collapse('hide');});
+        instance.init_activation(config.persistent_state);
 
     }
 
-
-    /**
-     * Send a message of a certain level to the logger.
-     *
-     * @param {string} message - The message which is to be send to the logger.
-     * @param {integer} [level=TRACE] - The level from 1 (Error) to 5 (Trace).
-     */
-    this.log = function(message, level=TRACE) {
-        if (level <= this.verbosity_level) {
-            var names = ["Error","Warning", "Info", "Debug", "Trace"];
-            if (typeof message === "string" || message instanceof String) {
-                console.log({level: names[level-1], logger: "tour", message: message});
-            } else {
-                console.log({level: names[level-1], logger: "tour", object: message});
-            }
-        }
+    this.add_tour_page = function (config, parent_set, idx) {
+        return new tour.Page(parent_set, config, idx);
     }
 
     /**
-     * Send a debug message to the logger.
-     *
-     * @param {string} message - The message which is to be send to the logger.
+     * TODO replace with function of the markdown module.
      */
-    this.debug = function(message) {
-        this.log(message, DEBUG);
-    }
-
-    this.warning = function(message) {
-        this.log(message, WARNING);
-    }
-
-    this.error = function(message) {
-        this.log(message, ERROR);
-    }
-
-    this.info = function(message) {
-        this.log(message, INFO);
-    }
-
-    this.add_tour_page = function(config, parent_set) {
-        return new tour.Page(parent_set, config);
-    }
-
-    this.markdown_to_html = function(content) {
+    this.markdown_to_html = function (content) {
         let converter = new showdown.Converter();
         return converter.makeHtml(content.trim());
     }
 
-    this.assert_array = function(content) {
-        if (! Array.isArray(content)) {
-                    return [content];
+    this.assert_array = function (content) {
+        if (!Array.isArray(content)) {
+            return [content];
         }
         return content;
     }
@@ -1043,13 +1524,13 @@ var tour = new function() {
     /**
      * Calls server-side script `scriptname`.
      */
-    this.run_script = async function(scriptname) {
+    this.run_script = async function (scriptname) {
         try {
             const script_result = await connection.runScript(scriptname);
             const retcode = script_result.getElementsByTagName("script")[0].getAttribute("code");
             if (parseInt(retcode) > 0) {
-                throw ("An error occurred during execution of the server-side script:\n"
-                       + script_result.getElementsByTagName("script")[0].outerHTML);
+                throw ("An error occurred during execution of the server-side script:\n" +
+                    script_result.getElementsByTagName("script")[0].outerHTML);
             }
         } catch (e) {
             globalError(e);
diff --git a/src/core/js/webcaosdb.js b/src/core/js/webcaosdb.js
index f5f65b93ca3722f58914ae4fee86f73ce5d83fc1..74dc62be15551f987707253ca201777f7c3929ac 100644
--- a/src/core/js/webcaosdb.js
+++ b/src/core/js/webcaosdb.js
@@ -116,21 +116,12 @@ this.navbar = new function () {
         }
 
         // wrapp button
-        let wrapper = $("<li></li>").append(button_elem);
+        let wrapper = $("<li class='nav-item'></li>").append(button_elem);
 
 
         // menu defaults to the navbar
         const menu = _options["menu"] || this.get_navbar();
 
-        if ($(menu).is("ul.caosdb-navbar")) {
-            // special styling for buttons which are added directly to the
-            // navbar
-            $(button_elem)
-                .toggleClass("navbar-btn", true)
-                .toggleClass("btn", true)
-                .toggleClass("btn-link", true);
-        }
-
         logger.debug("add", wrapper, "to", menu);
         $(menu).append(wrapper);
 
@@ -143,7 +134,7 @@ this.navbar = new function () {
             .on("shown.bs.collapse", function (e) {
                 logger.trace("navbar expands", e);
             })
-            .on("hidden.bs.collapse", function (e) {
+            .on("invisible.bs.collapse", function (e) {
                 logger.trace("navbar shrinks", e);
             });
         this.init_login_show_button();
@@ -151,7 +142,7 @@ this.navbar = new function () {
 
 
     /**
-     * Initialize the hiding/showing of the input form.
+     * Initialize the hiding/showing of the login form.
      *
      * If the viewport is xs (width <= 768px) the login form is hidden in the
      * a menu anyways.
@@ -173,15 +164,19 @@ this.navbar = new function () {
 
         // show form and hide the show_button
         const _in = () => {
-            // xs means viewport <= 768px
-            form.removeClass("visible-xs-inline-block");
-            show_button.addClass("hidden");
+          // xs means viewport <= 768px
+          form.removeClass("d-none");
+          form.addClass("d-xs-inline-block");
+          show_button.removeClass("d-inline-block");
+          show_button.addClass("d-none");
         }
         // hide form and show the show_button
         const _out = () => {
-            // xs means viewport <= 768px
-            form.addClass("visible-xs-inline-block");
-            show_button.removeClass("hidden");
+          // xs means viewport <= 768px
+          form.removeClass("d-xs-inline-block");
+          form.addClass("d-none");
+          show_button.removeClass("d-none");
+          show_button.addClass("d-inline-block");
         }
         show_button.on("click", () => {
             // show form...
@@ -217,9 +212,9 @@ this.navbar = new function () {
      * @return {HTMLElement} the dropdown-menu.
      */
     this.init_toolbox = function (name) {
-        var button = $(`<a class="dropdown-toggle"
-            data-toggle="dropdown" href="#">${name}
-            <span class="caret"></span></a>`)[0];
+        var button = $(`<a class="nav-link dropdown-bs-toggle"
+            data-bs-toggle="dropdown" href="#">${name}
+            </a>`)[0];
 
         var menu = $(`<ul
             class="caosdb-v-navbar-toolbox
@@ -312,6 +307,13 @@ this.caosdb_utils = new function () {
         return obj;
     }
 
+    this.assert_not_undefined = function (obj, name) {
+        if (typeof obj == "undefined" || obj == null) {
+            throw new TypeError(name + " must not be undefined")
+        }
+        return obj;
+    }
+
     this.assert_html_element = function (obj, name) {
         if (typeof obj === "undefined" || !(obj instanceof HTMLElement)) {
             throw new TypeError(name + " is expected to be an HTMLElement, was " + typeof obj);
@@ -586,7 +588,6 @@ this.transformation = new function () {
         var xsl = await transformation.retrieveXsltScript("property.xsl");
         insertParam(xsl, "filesystempath", connection.getBasePath() + "FileSystem/");
         insertParam(xsl, "entitypath", connection.getBasePath() + "Entity/");
-        insertParam(xsl, "close-char", '×');
         var entityXsl = await transformation.retrieveXsltScript('entity.xsl');
         var messageXsl = await transformation.retrieveXsltScript('messages.xsl');
         var commonXsl = await transformation.retrieveXsltScript('common.xsl');
@@ -594,15 +595,6 @@ this.transformation = new function () {
         let html = await asyncXslt(xml, xslt);
         return html;
     }
-    /**
-     * @param {XMLDocument} xml
-     * @return {HTMLElement[]} an array of HTMLElements.
-     */
-    this.transformEntityPalette = async function _tME(xml) {
-        var xsl = await transformation.retrieveXsltScript("entity_palette.xsl");
-        let html = await asyncXslt(xml, xsl);
-        return html;
-    }
 
     /**
      * Retrieve the entity.xsl script and modify it such that we can use it
@@ -622,7 +614,6 @@ this.transformation = new function () {
         var xslt = transformation.mergeXsltScripts(entityXsl, [errorXsl, commonXsl]);
         insertParam(xslt, "filesystempath", connection.getBasePath() + "FileSystem/");
         insertParam(xslt, "entitypath", connection.getBasePath() + "Entity/");
-        insertParam(xslt, "close-char", '×');
         xslt = injectTemplate(xslt, _root);
         return xslt;
     }
@@ -746,11 +737,11 @@ this.transaction = new function () {
             }
 
             // create the form element by element
-            let textarea = $('<div class="form-group"><textarea rows="8" style="width: 100%;" name="updateXml"/></div>');
+            let textarea = $('<div class="form-control"><textarea rows="8" style="width: 100%;" name="updateXml"/></div>');
             textarea.find('textarea').val(entityXmlStr);
-            let submitButton = $('<button class="btn btn-default" type="submit">Update</button>');
-            let resetButton = $('<button class="btn btn-default" type="reset">Reset</button>');
-            let form = $('<form class="panel-body"></form>');
+            let submitButton = $('<button class="btn btn-secondary" type="submit">Update</button>');
+            let resetButton = $('<button class="btn btn-secondary" type="reset">Reset</button>');
+            let form = $('<form class="card-body"></form>');
             form.toggleClass(transaction.classNameUpdateForm, true);
             form.append(textarea);
             form.append(submitButton);
@@ -868,7 +859,7 @@ this.transaction = new function () {
                                 // if there is an <Error> tag in the response, show
                                 // the response in a new form.
                                 app.openForm(xml2str(xml));
-                                transaction.update.addErrorNotification($(updatePanel).find('.panel-heading'), transaction.update.createErrorInUpdatedEntityNotification());
+                                transaction.update.addErrorNotification($(updatePanel).find('.card-header'), transaction.update.createErrorInUpdatedEntityNotification());
                             } else {
                                 // if there are no errors show the XSL-transformed
                                 // updated entity.
@@ -895,10 +886,10 @@ this.transaction = new function () {
             app.init(entity);
             app.updatePanel = updatePanel;
 
-            let closeButton = transaction.update.createCloseButton('.panel', () => {
+            let closeButton = transaction.update.createCloseButton('.card', () => {
                 app.resetApp();
             });
-            $(updatePanel).find('.panel-heading').prepend(closeButton);
+            $(updatePanel).find('.card-header').prepend(closeButton);
             return app;
         }
 
@@ -938,7 +929,7 @@ this.transaction = new function () {
          * @return {HTMLElement} A div.
          */
         this.createUpdateEntityPanel = function (heading) {
-            let panel = $('<div class="panel panel-default" style="border-color: blue;"/>');
+            let panel = $('<div class="card" style="border-color: blue;"/>');
             panel.append(heading);
             return panel[0];
         };
@@ -978,7 +969,7 @@ this.transaction = new function () {
         }
 
         this.createCloseButton = function (close, callback) {
-            let button = $('<button title="Cancel update" class="btn btn-link close" aria-label="Cancel update">&times;</button>');
+            let button = $('<button title="Cancel update" class="btn btn-link btn-close" aria-label="Cancel update">&times;</button>');
             button.bind('click', function () {
                 $(this).closest(close).hide();
                 callback();
@@ -1134,27 +1125,22 @@ var paging = new function () {
         if (nextHref != null) {
             // set href and show next button
             $('.caosdb-next-button').attr("href", nextHref);
-            $('.caosdb-next-button').show();
-            $('.caosdb-paging-panel').show();
-        } else {
-            $('.caosdb-next-button').hide();
         }
         if (prevHref != null) {
             // set href and show prev button
             $('.caosdb-prev-button').attr("href", prevHref);
-            $('.caosdb-prev-button').show();
-            $('.caosdb-paging-panel').show();
-        } else {
-            if (prevHref == nextHref) {
-                $('.caosdb-paging-panel').hide();
-            }
-            $('.caosdb-prev-button').hide();
         }
 
+        paging.toggle_paging_panel(!!prevHref || !!nextHref);
+
         return true;
 
     }
 
+    this.toggle_paging_panel = function (on) {
+        $(".caosdb-f-main").toggleClass("caosdb-f-show-paging-panel", on);
+    }
+
     /**
      * Replace the old page string in the given uri or concat it if there was no
      * page string. If page is null return null.
@@ -1275,6 +1261,13 @@ var paging = new function () {
         }
         return index + "L" + length;
     }
+
+    this.init = function () {
+        var response_count = document.body.getAttribute("data-response-count");
+        if (parseInt(response_count) >= 0) {
+            paging.initPaging(window.location.href, response_count);
+        }
+    }
 };
 
 var queryForm = new function () {
@@ -1491,9 +1484,9 @@ var hintMessages = new function () {
             });
         }
 
-        // moves all badges into one div with text-right
+        // moves all badges into one div with text-end
         if ($(entity).find(".caosdb-messages > .caosdb-f-message-badge").length > 0) {
-            var div = $('<div class="text-right" style="padding: 5px 16px;"/>');
+            var div = $('<div class="text-end" style="padding: 5px 16px;"/>');
             div.prependTo($(entity).find(".caosdb-messages"));
             var messageBadges = $(entity).find(".caosdb-messages > .caosdb-f-message-badge");
             messageBadges.detach();
@@ -1853,18 +1846,12 @@ this.user_management = function ($, connection, createWaitingNotification, creat
     };
 }($, connection, createWaitingNotification, createErrorNotification);
 
-/**
- * When the page is scrolled down 100 pixels, the scroll-back button appears.
- * 
- * @return FIXME
- */
 
 /**
- * Every initial function calling is done here.
- * 
- * @return TODO
+ * Initialize all the submodules.
  */
 function initOnDocumentReady() {
+    paging.init();
     hintMessages.init();
 
     // init query form
@@ -1875,15 +1862,16 @@ function initOnDocumentReady() {
 
     // show image 100% width
     $(".entity-image-preview").click(function () {
-        $(this).css('width', '100%');
-        $(this).css('max-width', "");
+        $(this).css('max-width', '100%');
         $(this).css('max-height', "");
     });
 
-    if (typeof caosdb_modules.auto_init === "undefined") {
+    if (typeof _caosdb_modules_auto_init === "undefined") {
         // the test index.html sets this to false, 
         // unset -> no tests
         caosdb_modules.auto_init = true;
+    } else {
+        caosdb_modules.auto_init = _caosdb_modules_auto_init;
     }
     caosdb_modules.init();
     navbar.init();
@@ -1950,4 +1938,4 @@ class _CaosDBModules {
 
 var caosdb_modules = new _CaosDBModules()
 
-$(document).ready(initOnDocumentReady);
\ No newline at end of file
+$(document).ready(initOnDocumentReady);
diff --git a/src/core/webcaosdb.xsl b/src/core/webcaosdb.xsl
index cb1ad2966cb2006767309da96151196102c3af57..9a0d6769f1901e860c7a2318fce28957d6461496 100644
--- a/src/core/webcaosdb.xsl
+++ b/src/core/webcaosdb.xsl
@@ -27,6 +27,7 @@
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="html" />
 
+  <xsl:include href="xsl/jsheader.xsl" />
   <xsl:include href="xsl/main.xsl" />
   <xsl:include href="xsl/navbar.xsl" />
   <xsl:include href="xsl/messages.xsl" />
@@ -37,6 +38,17 @@
   <xsl:include href="xsl/common.xsl"/>
   <xsl:include href="xsl/welcome.xsl"/>
 
+  <xsl:template name="caosdb-tour-toc">
+    <div class="caosdb-v-tour-toc-sidebar" id="tour-toc">
+    <div class="caosdb-v-tour-toc-show"></div>
+    <button class="caosdb-v-tour-toc-show caosdb-f-tour-toc-toggle btn"></button>
+    <div class="caosdb-v-tour-toc-header">
+      <h3>Tour</h3>
+    </div>
+    <div class="caosdb-f-tour-toc-body"></div>
+    </div>
+  </xsl:template>
+
   <xsl:template match="/">
     <html lang="en">
       <head>
@@ -54,9 +66,21 @@
         <xsl:call-template name="caosdb-head-js" />
       </head>
       <body>
-        <xsl:call-template name="caosdb-top-navbar" />
-        <xsl:call-template name="caosdb-data-container" />
-        <footer>
+        <xsl:attribute name="data-response-count">
+          <xsl:value-of select="/Response/@count"/>
+        </xsl:attribute>
+        <xsl:if test="count(/Response/*)&lt;3 and not(/Response/Error|/Response/Info|/Response/Warning)">
+            <xsl:attribute name="class">caosdb-welcome</xsl:attribute>
+        </xsl:if>
+        <div class="background d-flex flex-column">
+          <xsl:call-template name="caosdb-tour-toc" />
+          <xsl:call-template name="caosdb-top-navbar" />
+          <xsl:call-template name="caosdb-data-container" />
+          <xsl:if test="count(/Response/*)&lt;3 and not(/Response/Error|/Response/Info|/Response/Warning)">
+            <xsl:call-template name="welcome"/>
+          </xsl:if>
+        </div>
+        <footer class="py-5">
           <xsl:call-template name="caosdb-footer"/>
         </footer>
       </body>
diff --git a/src/core/xsl/annotation.xsl b/src/core/xsl/annotation.xsl
index f41f6cbb47680bc9825300de645ae39c67c809cb..1ed1d28fe00cffaa2bde79cd7fef070b49771b38 100644
--- a/src/core/xsl/annotation.xsl
+++ b/src/core/xsl/annotation.xsl
@@ -23,31 +23,33 @@
 -->
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="html"/>
-  <xsl:template match="History" mode="comment-annotation-header">
-    <h4 class="media-heading">
+  <xsl:template match="Version" mode="comment-annotation-header">
+    <div class="caosdb-f-comment-header">
       <xsl:value-of select="@username"/>
       <small>
         <i>
           <xsl:text> posted on </xsl:text>
-          <xsl:value-of select="@datetime"/>
+          <xsl:value-of select="@date"/>
         </i>
       </small>
-    </h4>
+    </div>
   </xsl:template>
   <xsl:template match="Property" mode="comment-annotation-text">
-    <p class="caosdb-comment-annotation-text">
-      <xsl:value-of select="text()"/>
-    </p>
+    <div class="caosdb-f-comment-body">
+      <small>
+        <p class="caosdb-comment-annotation-text">
+          <xsl:value-of select="text()"/>
+        </p>
+      </small>
+    </div>
   </xsl:template>
   <xsl:template match="Record" mode="comment-annotation">
-    <div class="media">
-      <div class="media-left">
-        <h3>
-          <xsl:text>»</xsl:text>
-        </h3>
+    <div class="d-flex">
+      <div class="d-shrink-0">
+        <xsl:text>»</xsl:text>
       </div>
-      <div class="media-body">
-        <xsl:apply-templates mode="comment-annotation-header" select="History[translate(@transaction,'insert','INSERT')='INSERT']"/>
+      <div class="flex-grow-1 ms-3">
+        <xsl:apply-templates mode="comment-annotation-header" select="Version[@head='true']"/>
         <xsl:apply-templates mode="comment-annotation-text" select="Property[@name='comment']"/>
       </div>
     </div>
@@ -59,7 +61,7 @@
   </xsl:template>
   <xsl:template match="Record" mode="error">
     <div class="alert alert-danger caosdb-new-comment-error alert-dismissable">
-      <button class="close" data-dismiss="alert" aria-label="close">×</button>
+      <button class="btn-close" data-bs-dismiss="alert" aria-label="close">×</button>
       <strong>Error!</strong>
             This comment has not been inserted.
             <p class="small"><pre><code><xsl:copy-of select="."/></code></pre></p></div>
diff --git a/src/core/xsl/common.xsl b/src/core/xsl/common.xsl
index 395c22063b8e2cdb6725ee2bd4cc859f9fb7be2c..abaa86e34f54e7e59b1df517c177018e4100dea5 100644
--- a/src/core/xsl/common.xsl
+++ b/src/core/xsl/common.xsl
@@ -26,12 +26,10 @@
   <xsl:template name="make-filesystem-link">
     <xsl:param name="href"/>
     <xsl:param name="display" select="$href"/>
-    <a>
       <xsl:attribute name="href">
         <xsl:value-of select="concat($filesystempath,$href)"/>
       </xsl:attribute>
       <xsl:value-of select="$display"/>
-    </a>
   </xsl:template>
 
   <xsl:template name="trim">
diff --git a/src/core/xsl/entity.xsl b/src/core/xsl/entity.xsl
index 02979a2bea5c057a848e64de9e1ac3c09114177c..d562bf99f7611b976e10d5349d0c99972d6d8fdd 100644
--- a/src/core/xsl/entity.xsl
+++ b/src/core/xsl/entity.xsl
@@ -26,39 +26,41 @@
   <!-- These little colored Rs, RTs, Ps, and Fs which hilite the beginning 
         of a new entity. -->
   <xsl:template match="Property" mode="entity-heading-label">
-    <span class="label caosdb-f-entity-role caosdb-label-property"
+    <span class="badge caosdb-f-entity-role caosdb-label-property me-1"
     data-entity-role="Property" title="This entity is a Property.">P</span>
   </xsl:template>
   <xsl:template match="Record" mode="entity-heading-label">
-    <span class="label caosdb-f-entity-role caosdb-label-record"
+    <span class="badge caosdb-f-entity-role caosdb-label-record me-1"
     data-entity-role="Record" title="This entity is a Record.">R</span>
   </xsl:template>
   <xsl:template match="RecordType" mode="entity-heading-label">
-    <span class="label caosdb-f-entity-role caosdb-label-recordtype"
+    <span class="badge caosdb-f-entity-role caosdb-label-recordtype me-1"
     data-entity-role="RecordType" title="This entity is a Record Type.">RT</span>
   </xsl:template>
   <xsl:template match="File" mode="entity-heading-label">
-    <span class="label caosdb-f-entity-role caosdb-label-file"
+    <span class="badge caosdb-f-entity-role caosdb-label-file me-1"
     data-entity-role="File" title="This entity is a File.">F</span>
   </xsl:template>
   <xsl:template match="@id" mode="backreference-link">
-    <a class="caosdb-backref-link label caosdb-id-button" title="Find all entities which reference this one.">
+    <a class="caosdb-backref-link btn caosdb-id-button" title="Find all entities which reference this one.">
       <xsl:attribute name="href">
         <xsl:value-of select="concat($entitypath, '?P=0L10&amp;query=FIND+Entity+which+references+', current())"/>
       </xsl:attribute>
-      <span class="glyphicon glyphicon-share-alt flipped-horiz-icon"/>
-      <span class="hidden-xs"> References</span>
+      <span class="bg-dark badge d-none d-sm-inline">
+        <i class="bi-link"></i> References
+      </span>
+      <i class="bi-link d-inline d-sm-none"></i>
     </a>
   </xsl:template>
   <!-- special entity properties like type, checksum, path... -->
   <xsl:template match="@datatype" mode="entity-heading-attributes-datatype">
-    <p class="caosdb-entity-heading-attr small text-justify">
+    <p class="caosdb-entity-heading-attr small">
       <em class="caosdb-entity-heading-attr-name">data type:</em>
       <xsl:value-of select="."/>
     </p>
   </xsl:template>
   <xsl:template match="@checksum" mode="entity-heading-attributes-checksum">
-    <p class="caosdb-entity-heading-attr caosdb-overflow-box small text-justify">
+    <p class="caosdb-entity-heading-attr caosdb-overflow-box small">
       <em class="caosdb-entity-heading-attr-name">
         <xsl:value-of select="concat(name(),':')"/>
       </em>
@@ -68,18 +70,20 @@
     </p>
   </xsl:template>
   <xsl:template match="@path" mode="entity-heading-attributes-path">
-    <p class="caosdb-entity-heading-attr small text-justify">
+    <p class="caosdb-entity-heading-attr small">
       <em class="caosdb-entity-heading-attr-name">
         <xsl:value-of select="concat(name(),':')"/>
       </em>
-      <xsl:call-template name="make-filesystem-link">
-        <xsl:with-param name="href" select="."/>
-      </xsl:call-template>
+      <a>
+        <xsl:call-template name="make-filesystem-link">
+          <xsl:with-param name="href" select="."/>
+        </xsl:call-template>
+      </a>
     </p>
   </xsl:template>
   <!-- Any further entity attributes -->
   <xsl:template match="@*" mode="entity-heading-attributes">
-    <p class="caosdb-entity-heading-attr small text-justify">
+    <p class="caosdb-entity-heading-attr small">
       <em class="caosdb-entity-heading-attr-name">
         <xsl:value-of select="concat(name(),':')"/>
       </em>
@@ -87,7 +91,7 @@
     </p>
   </xsl:template>
   <xsl:template match="*" mode="entity-action-panel">
-    <div class="caosdb-entity-actions-panel text-right btn-group-xs">
+    <div class="caosdb-entity-actions-panel text-end btn-group-sm">
         <xsl:apply-templates select="Version/Successor" mode="entity-action-panel-version">
           <xsl:with-param name="entityId" select="@id"/>
         </xsl:apply-templates>
@@ -95,7 +99,7 @@
   </xsl:template>
   <!-- Main entry for ENTITIES -->
   <xsl:template match="Property|Record|RecordType|File" mode="entities">
-    <div class="panel panel-default caosdb-entity-panel">
+    <div class="card caosdb-entity-panel mb-2">
       <xsl:apply-templates select="Version" mode="entity-version-marker"/>
       <xsl:attribute name="id">
         <xsl:value-of select="@id"/>
@@ -111,20 +115,18 @@
       <xsl:apply-templates mode="entity-permissions" select="Permissions"/>
       <!-- A page-unique ID for this entity -->
       <xsl:variable name="entityid" select="concat('entity_',generate-id())"/>
-      <div class="panel-heading caosdb-entity-panel-heading">
+      <div class="card-header caosdb-entity-panel-heading">
         <xsl:attribute name="data-entity-datatype">
           <xsl:value-of select="@datatype"/>
         </xsl:attribute>
-        <div class="row">
-          <div class="col-sm-8">
-            <h5>
+        <div class="d-flex flex-wrap align-items-baseline">
               <xsl:apply-templates mode="entity-heading-label" select="."/>
               <!-- Parents -->
               <span class="caosdb-f-parent-list">
                 <xsl:if test="Parent">
                   <!-- <xsl:apply-templates select="Parent" mode="entity-body" /> -->
                   <xsl:for-each select="Parent">
-                    <span class="caosdb-parent-item small">
+                    <span class="badge caosdb-parent-item me-1">
                       <!-- TODO lots of code duplication with parent.xsl -->
                       <xsl:attribute name="id">
                         <xsl:value-of select="generate-id()"/>
@@ -146,27 +148,23 @@
                 </xsl:attribute>
                 <xsl:value-of select="@name"/>
               </a>
-            </h5>
-          </div>
-          <div class="col-sm-4 text-right">
-            <h5 class="caosdb-v-entity-header-buttons-list">
+            <div class="caosdb-v-entity-header-buttons-list ms-auto">
               <xsl:apply-templates mode="entity-heading-attributes-state" select="State">
                 <xsl:with-param name="entityId" select="@id"/>
                 <xsl:with-param name="hasSuccessor" select="Version/Successor"/>
               </xsl:apply-templates>
+              <xsl:apply-templates mode="backreference-link" select="@id"/>
               <!-- Button for expanding/collapsing the comments section-->
-              <span class="caosdb-clickable glyphicon glyphicon-comment" data-toggle="collapse" title="Toggle the comments section at the bottom of this entity.">
-                <xsl:attribute name="data-target">
+              <button class="btn caosdb-v-entity-comment-badge" data-bs-toggle="collapse" title="Toggle the comments section at the bottom of this entity.">
+                <xsl:attribute name="data-bs-target">
                   <xsl:value-of select="concat('#', 'comment_', $entityid)"/>
                 </xsl:attribute>
-              </span>
-              <span>
-              <xsl:apply-templates mode="backreference-link" select="@id"/>
-              </span>
-              <span class="label caosdb-id caosdb-id-button hidden">
+                <i class="bi-chat-left-fill"/>
+              </button>
+              <span class="badge bg-dark caosdb-id caosdb-id-button d-none">
                 <xsl:value-of select="@id"/>
               </span>
-              <button class="btn btn-link caosdb-v-bookmark-button">
+              <button class="btn caosdb-v-bookmark-button">
                 <xsl:attribute name="data-bmval">
                   <xsl:value-of select="@id"/>
                   <xsl:if test="Version/Successor">
@@ -174,13 +172,12 @@
                     <xsl:value-of select="concat('@', Version/@id)"/>
                   </xsl:if>
                 </xsl:attribute>
-                <span class="glyphicon glyphicon-bookmark"/>
+                <i class="bi-bookmark-fill"></i>
               </button>
               <xsl:apply-templates mode="entity-heading-attributes-version" select="Version">
                 <xsl:with-param name="entityId" select="@id"/>
               </xsl:apply-templates>
-            </h5>
-          </div>
+            </div>
         </div>
         <xsl:apply-templates mode="entity-heading-attributes" select="@description"/>
         <xsl:apply-templates mode="entity-heading-attributes-datatype" select="@datatype"/>
@@ -195,7 +192,7 @@
         </xsl:if>
       </div>
       <xsl:apply-templates mode="entity-action-panel" select="."/>
-      <div class="panel-body caosdb-entity-panel-body">
+      <div class="card-body caosdb-entity-panel-body">
         <!-- Messages -->
         <div class="caosdb-messages">
           <xsl:apply-templates select="Error">
@@ -211,9 +208,6 @@
         <!-- Properties -->
         <ul class="list-group caosdb-properties">
           <xsl:if test="Property">
-            <li class="list-group-item caosdb-properties-heading">
-              <strong class="small">Properties</strong>
-            </li>
             <xsl:apply-templates mode="entity-body" select="Property"/>
           </xsl:if>
         </ul>
@@ -246,44 +240,36 @@
       <xsl:apply-templates select="Info">
         <xsl:with-param name="class" select="'alert-info'"/>
       </xsl:apply-templates>
-      <!-- collapsed data -->
-      <div class="collapse">
-        <xsl:attribute name="id">
-          <xsl:value-of select="$collapseid"/>
-        </xsl:attribute>
-        <hr class="caosdb-subproperty-divider"/>
-        <!--  <li> -->
-              <!-- <a class="caosdb-property-name"> -->
-              <!--           <xsl:attribute name="href"> -->
-              <!--               <xsl:value-of select="concat($entitypath,@id)" /></xsl:attribute> -->
-              <!-- </a> -->
-              <!-- </li> -->
-
-                <!-- property attributes -->
-        <xsl:apply-templates mode="property-attributes" select="@description"/>
-        <xsl:apply-templates mode="property-attributes-id" select="@id"/>
-        <xsl:apply-templates mode="property-attributes-type" select="@datatype"/>
-        <xsl:apply-templates mode="property-attributes" select="@*[not(contains('+cuid+id+name+description+datatype+',concat('+',name(),'+')))]"/>
-      </div>
         </li>
   </xsl:template>
   <xsl:template match="Property" mode="property-collapsed">
     <xsl:param name="collapseid"/>
     <div class="row">
-      <div class="col-sm-4">
-        <h5>
+      <div class="col-sm-6 col-md-4 caosdb-v-property-left-col">
           <xsl:if test="@*[not(contains('+cuid+id+name+',concat('+',name(),'+')))]">
-            <span class="glyphicon glyphicon-collapse-down caosdb-clickable" data-toggle="collapse" style="margin-right: 10px;">
-              <xsl:attribute name="data-target">
+            <i data-bs-toggle="collapse" style="position: absolute; left: 1rem;" class="bi-caret-down-square fs-6 caosdb-clickable">
+              <xsl:attribute name="data-bs-target">
                 <xsl:value-of select="concat('#',$collapseid)"/>
               </xsl:attribute>
-            </span>
+            </i>
           </xsl:if>
-          <strong class="caosdb-property-name"> <xsl:value-of select="@name"/></strong>
-        </h5>
+          <span class="caosdb-property-name"> <xsl:value-of select="@name"/></span>
+      </div>
+      <!-- collapsed data -->
+      <div class="collapse order-sm-last">
+        <xsl:attribute name="id">
+          <xsl:value-of select="$collapseid"/>
+        </xsl:attribute>
+        <hr class="caosdb-subproperty-divider"/>
+        <dl class="row caosdb-v-entity-property-attributes">
+        <xsl:apply-templates mode="property-attributes" select="@description"/>
+        <xsl:apply-templates mode="property-attributes-id" select="@id"/>
+        <xsl:apply-templates mode="property-attributes-type" select="@datatype"/>
+        <xsl:apply-templates mode="property-attributes" select="@*[not(contains('+cuid+id+name+description+datatype+',concat('+',name(),'+')))]"/>
+        </dl>
       </div>
       <!-- property value -->
-      <div class="col-sm-8 caosdb-f-property-value">
+      <div class="col-sm-6 col-md-8 caosdb-f-property-value">
         <xsl:apply-templates mode="property-value" select="."/>
       </div>
     </div>
@@ -297,7 +283,7 @@
         <xsl:choose>
           <xsl:when test="$reference='true' and normalize-space($value)!=''">
             <!-- this is a reference -->
-            <a class="btn btn-default btn-sm caosdb-f-reference-value caosdb-resolvable-reference">
+            <a class="btn btn-outline-dark btn-sm caosdb-f-reference-value caosdb-resolvable-reference">
               <xsl:attribute name="href">
                 <xsl:value-of select="concat($entitypath,normalize-space($value))"/>
               </xsl:attribute>
@@ -323,7 +309,7 @@
                 <!-- DEPRECATED css class .caosdb-property-text-value - Use
                      .caosdb-f-property-single-raw-value or introduce new 
                      .caosdb-v-property-text-value -->
-                <xsl:value-of select="'caosdb-f-property-single-raw-value caosdb-property-text-value'"/>
+                <xsl:value-of select="'caosdb-f-property-single-raw-value caosdb-property-text-value caosdb-f-property-text-value caosdb-v-property-text-value'"/>
               </xsl:attribute>
               <xsl:call-template name="trim">
                 <xsl:with-param name="str">
@@ -338,7 +324,7 @@
         <!-- DEPRECATED css class .caosdb-property-text-value - Use
              .caosdb-f-property-single-raw-value or introduce new 
              .caosdb-v-property-text-value -->
-        <span class="caosdb-f-property-single-raw-value caosdb-property-text-value"/>
+        <span class="caosdb-f-property-single-raw-value caosdb-property-text-value caosdb-f-property-text-value caosdb-v-property-text-value"/>
       </xsl:otherwise>
     </xsl:choose>
   </xsl:template>
@@ -382,7 +368,7 @@
         <xsl:attribute name="class">list-group list-inline</xsl:attribute>
         <xsl:for-each select="Value">
           <xsl:element name="li">
-            <xsl:attribute name="class">list-group-item</xsl:attribute>
+            <xsl:attribute name="class">list-inline-item</xsl:attribute>
             <xsl:call-template name="single-value">
               <xsl:with-param name="reference">
                 <xsl:value-of select="'false'"/>
@@ -469,43 +455,27 @@
     </xsl:choose>
   </xsl:template>
   <xsl:template match="@*" mode="property-attributes">
-    <div class="row">
-      <div class="col-sm-3 col-sm-offset-1">
-        <strong>
-          <xsl:value-of select="name()"/>
-        </strong>
-      </div>
-      <div class="col-sm-8">
-        <xsl:value-of select="."/>
-      </div>
-    </div>
+    <dt class="col-6 col-md-4 mb-0"><xsl:value-of select="name()"/></dt>
+    <dd class="col-6 col-md-8 mb-0">
+      <xsl:value-of select="."/>
+    </dd>
   </xsl:template>
   <xsl:template match="@datatype" mode="property-attributes-type">
-    <div class="row">
-      <div class="col-sm-3 col-sm-offset-1">
-        <strong>data type</strong>
-      </div>
-      <div class="col-sm-8 caosdb-property-datatype">
-        <xsl:value-of select="."/>
-      </div>
-    </div>
+    <dt class="col-6 col-md-4 mb-0">data type</dt>
+    <dd class="col-6 col-md-8 mb-0 caosdb-property-datatype">
+      <xsl:value-of select="."/>
+    </dd>
   </xsl:template>
   <xsl:template match="@id" mode="property-attributes-id">
-    <div class="row">
-      <div class="col-sm-3 col-sm-offset-1">
-        <strong>
-          <xsl:value-of select="name()"/>
-        </strong>
-      </div>
-      <div class="col-sm-8">
-        <a class="caosdb-property-id">
-          <xsl:attribute name="href">
-            <xsl:value-of select="concat($entitypath,.)"/>
-          </xsl:attribute>
-          <xsl:value-of select="."/>
-        </a>
-      </div>
-    </div>
+    <dt class="col-6 col-md-4 mb-0">id</dt>
+    <dd class="col-6 col-md-8 mb-0">
+      <a class="caosdb-property-id">
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat($entitypath,.)"/>
+        </xsl:attribute>
+        <xsl:value-of select="."/>
+      </a>
+    </dd>
   </xsl:template>
   <!-- ANNOTATIONS -->
   <xsl:template name="annotation-section">
@@ -518,10 +488,10 @@
       <xsl:attribute name="id">
         <xsl:value-of select="$collapseId"/>
       </xsl:attribute>
-      <li class="list-group-item caosdb-comments-heading">
-        <span class="glyphicon glyphicon-comment" style="margin-right: 1em;"/>
+      <li class="list-group-item caosdb-comments-heading d-flex">
+        <i class="bi-chat-left-fill" style="margin-right: 1em;"/>
         <strong class="small">Comments</strong>
-        <button class="btn btn-link btn-xs pull-right caosdb-new-comment-button">
+        <button class="btn btn-sm pull-right caosdb-new-comment-button ms-auto">
           <strong>add new comment</strong>
         </button>
       </li>
@@ -534,26 +504,25 @@
     <xsl:param name="entityId"/>
     <xsl:param name="hasSuccessor"/>
     <xsl:param name="stateModalId">state-modal-<xsl:value-of select="generate-id()"/></xsl:param>
-    <span title="State Info">
-      <a data-toggle="modal" class="btn btn-link label label-info caosdb-v-state-label">
+    <button title="State Info" class="btn" data-bs-toggle="modal">
+      <xsl:attribute name="data-bs-target">#<xsl:value-of select="$stateModalId"/></xsl:attribute>
+      <span class="badge label-info caosdb-v-state-label">
         <xsl:if test="@color">
           <xsl:attribute name="style">background-color: <xsl:value-of select="@color"/>;</xsl:attribute>
         </xsl:if>
-        <xsl:attribute name="data-target">#<xsl:value-of select="$stateModalId"/></xsl:attribute>
         <xsl:value-of select="./@name"/>
-      </a>
-    </span>
+      </span>
+    </button>
 
     <!-- here comes the modal -->
     <div class="caosdb-f-entity-state-info modal fade" tabindex="-1" role="dialog">
       <xsl:attribute name="id"><xsl:value-of select="$stateModalId"/></xsl:attribute>
       <div class="modal-dialog" role="document">
         <div class="modal-content text-left">
-          <div class="modal-header">
-            <button type="button" class="close" data-dismiss="modal" aria-label="Close" title="Close"><span aria-hidden="true">×</span></button>
-            <h4 class="modal-title">
-              <span class="label label-default caosdb-v-state-model-label" style="padding-right: 0"><xsl:value-of select="@model"/>
-                <span title="State Info" class="label label-info caosdb-v-state-label">
+          <div class="modal-header flex-wrap">
+            <span class="modal-title">
+              <span class="badge caosdb-v-state-model-label"><xsl:value-of select="@model"/>
+                <span title="State Info" class="badge badge-info caosdb-v-state-label">
                   <xsl:attribute name="style">
                     <xsl:if test="@color">
                       background-color: <xsl:value-of select="@color"/>;
@@ -561,7 +530,8 @@
                   </xsl:attribute>
                 <xsl:value-of select="@name"/></span>
               </span>
-            </h4>
+            </span>
+            <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close" title="Close"></button>
             <div style="margin-top: 8px"><em><xsl:value-of select="@description"/></em></div>
           </div>
           <div class="modal-body">
@@ -578,20 +548,19 @@
                 <xsl:if test="not(Transition)">
                     You cannot perform any transitions. Maybe this is due to lack of permissions.
                 </xsl:if>
-                <dl class="dl-horizontal caosdb-f-transition">
+                <dl class="row caosdb-f-transition">
                 <xsl:for-each select="Transition">
-                  <dt><button class="btn label label-info caosdb-f-entity-state-transition-button" type="button">
+                  <dt class="col-sm-4 mb-2"><button class="btn btn-secondary badge caosdb-f-entity-state-transition-button fs-6" type="button">
                         <xsl:attribute name="data-to-state"><xsl:value-of select="ToState/@name"/></xsl:attribute>
                         <xsl:attribute name="data-transition-name"><xsl:value-of select="@name"/></xsl:attribute>
                         <xsl:attribute name="title">Transition to state '<xsl:value-of select="ToState/@name"/>'. <xsl:if test="ToState/@description"><xsl:value-of select="ToState/@description"/></xsl:if></xsl:attribute>
-                        <xsl:attribute name="style">
-                            font-size: 110%;
-                          <xsl:if test="@color">
+                        <xsl:if test="@color">
+                          <xsl:attribute name="style">
                             background-color: <xsl:value-of select="@color"/>;
-                          </xsl:if>
-                        </xsl:attribute>
+                          </xsl:attribute>
+                        </xsl:if>
                       <xsl:value-of select="@name"/></button></dt>
-                  <dd><xsl:value-of select="@description"/></dd>
+                  <dd class="col-sm-8"><xsl:value-of select="@description"/></dd>
                 </xsl:for-each>
                 </dl>
               </xsl:otherwise>
@@ -612,8 +581,8 @@
     <xsl:param name="entityId"/>
     <xsl:param name="versionModalId">version-modal-<xsl:value-of select="generate-id()"/></xsl:param>
     <!-- the clock button which opens the window with the versioning info -->
-    <button title="Versioning Info" type="button" data-toggle="modal">
-      <xsl:attribute name="data-target">#<xsl:value-of select="$versionModalId"/></xsl:attribute>
+    <button title="Versioning Info" type="button" data-bs-toggle="modal">
+      <xsl:attribute name="data-bs-target">#<xsl:value-of select="$versionModalId"/></xsl:attribute>
       <xsl:attribute name="class">
         caosdb-f-entity-version-button caosdb-v-entity-version-button btn
         <xsl:if test="Successor">
@@ -621,7 +590,7 @@
           <xsl:value-of select="' text-danger'"/>
         </xsl:if>
       </xsl:attribute>
-      <span class="glyphicon glyphicon-time"/>
+      <i class="bi-clock-history"/>
     </button>
 
     <!-- the following div.modal is the window that pops up when the user clicks on the clock button -->
@@ -634,23 +603,24 @@
           <div>
             <xsl:attribute name="class">
               modal-header
+              text-start
               <xsl:if test="not(@head='true')">
                 <!-- indicate old version by color -->
                 <xsl:value-of select="' bg-danger'"/>
               </xsl:if>
             </xsl:attribute>
-            <button type="button" class="close" data-dismiss="modal" aria-label="Close" title="Close"><span aria-hidden="true">×</span></button>
-            <h4 class="modal-title">Version Info</h4>
-              <p class="caosdb-entity-heading-attr">
-              <em class="caosdb-entity-heading-attr-name">
-              This is
-              <xsl:if test="not(@head='true')"><b>not</b></xsl:if>
-              the latest version of this entity.
-              <xsl:apply-templates mode="entity-version-modal-head" select="Successor">
-                <xsl:with-param name="entityId" select="$entityId"/>
-              </xsl:apply-templates>
-              </em>
-            </p>
+              <p class="caosdb-entity-version-attr">
+                <h4 class="modal-title">Version Info</h4>
+                <em class="caosdb-entity-version-attr-name">
+                This is
+                <xsl:if test="not(@head='true')"><b>not</b></xsl:if>
+                the latest version of this entity.
+                <xsl:apply-templates mode="entity-version-modal-head" select="Successor">
+                  <xsl:with-param name="entityId" select="$entityId"/>
+                </xsl:apply-templates>
+                </em>
+              </p>
+            <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close" title="Close"></button>
           </div>
           <!-- modal-header end -->
           <div class="caosdb-f-entity-version-history">
@@ -674,14 +644,14 @@
             <th class="export-data">Version ID</th>
             <th class="export-data">Date</th>
             <th class="export-data">User</th>
-            <th class="hidden"><div class="export-data">URI</div></th>
+            <th class="invisible"><div class="export-data">URI</div></th>
           </tr></thead>
         <tbody>
           <xsl:apply-templates mode="entity-version-modal-successor" select="Successor">
             <xsl:with-param name="entityId" select="$entityId"/>
           </xsl:apply-templates>
           <tr>
-            <td class="hidden"><div class="export-data"><xsl:value-of select="$entityId"/></div></td>
+            <td class="invisible"><div class="export-data"><xsl:value-of select="$entityId"/></div></td>
             <td class="caosdb-v-entity-version-hint caosdb-v-entity-version-hint-cur">This Version</td>
             <td><xsl:apply-templates select="@id" mode="entity-version-id"/>
             </td><td>
@@ -689,7 +659,7 @@
             </td><td class="export-data">
               <xsl:value-of select="@username"/>@<xsl:value-of select="@realm"/>
             </td>
-            <td class="hidden"><div class="export-data"><xsl:value-of select="concat($entitypath, $entityId, '@', @id)"/></div></td>
+            <td class="invisible"><div class="export-data"><xsl:value-of select="concat($entitypath, $entityId, '@', @id)"/></div></td>
           </tr>
           <xsl:apply-templates mode="entity-version-modal-predecessor" select="Predecessor">
             <xsl:with-param name="entityId" select="$entityId"/>
@@ -698,7 +668,7 @@
       </table>
     </div>
     <div class="modal-footer">
-      <button type="button" class="caosdb-f-entity-version-export-history-btn btn btn-default">Export history</button>
+      <button type="button" class="caosdb-f-entity-version-export-history-btn btn btn-secondary">Export history</button>
     </div>
   </xsl:template>
 
@@ -734,7 +704,7 @@
       </table>
     </div>
     <div class="modal-footer">
-      <button type="button" style="display: none" class="caosdb-f-entity-version-load-history-btn btn btn-default">Load full history</button>
+      <button type="button" style="display: none" class="caosdb-f-entity-version-load-history-btn btn btn-secondary">Load full history</button>
     </div>
   </xsl:template>
 
@@ -742,7 +712,7 @@
     <!-- a versions'id (abbreviated) -->
     <xsl:attribute name="title">Full Version ID: <xsl:value-of select="."/></xsl:attribute>
     <xsl:value-of select="substring(.,1,8)"/>
-    <td class="hidden"><div class="export-data"><xsl:value-of select="."/></div></td>
+    <td class="invisible"><div class="export-data"><xsl:value-of select="."/></div></td>
   </xsl:template>
 
   <xsl:template match="@date" mode="entity-version-date">
@@ -751,7 +721,7 @@
     <xsl:value-of select="substring(.,0,11)"/>
     <xsl:value-of select="' '"/>
     <xsl:value-of select="substring(.,12,8)"/>
-    <td class="hidden"><div class="export-data"><xsl:value-of select="."/></div></td>
+    <td class="invisible"><div class="export-data"><xsl:value-of select="."/></div></td>
   </xsl:template>
 
   <xsl:template match="Predecessor|Successor" mode="entity-version-modal-single-history-item">
@@ -759,7 +729,7 @@
     <xsl:param name="entityId"/>
     <xsl:param name="hint"/>
     <tr>
-      <td class="hidden"><div class="export-data"><xsl:value-of select="$entityId"/></div></td>
+      <td class="invisible"><div class="export-data"><xsl:value-of select="$entityId"/></div></td>
       <td class="caosdb-v-entity-version-hint"><xsl:value-of select="$hint"/></td>
       <td>
         <xsl:apply-templates select="@id" mode="entity-version-link-to-other-version">
@@ -770,7 +740,7 @@
       </td><td class="export-data">
         <xsl:value-of select="@username"/>@<xsl:value-of select="@realm"/>
       </td>
-      <td class="hidden"><div class="export-data"><xsl:value-of select="concat($entitypath, $entityId, '@', @id)"/></div></td>
+      <td class="invisible"><div class="export-data"><xsl:value-of select="concat($entitypath, $entityId, '@', @id)"/></div></td>
     </tr>
   </xsl:template>
 
@@ -817,7 +787,7 @@
   <xsl:template match="Version/Successor" mode="entity-action-panel-version">
     <!-- clickable warning message in the entity actions panel when there exists a newer version -->
     <xsl:param name="entityId"/>
-    <a class="caosdb-f-entity-version-old-warning alert-warning btn btn-link" title="Go to the latest version of this entity.">
+    <a class="caosdb-f-entity-version-old-warning alert-warning btn" title="Go to the latest version of this entity.">
       <xsl:attribute name="href"><xsl:value-of select="$entityId"/>@HEAD</xsl:attribute>
       <strong>Warning</strong> A newer version exists!
     </a>
diff --git a/src/core/xsl/entity_palette.xsl b/src/core/xsl/entity_palette.xsl
index 961a51dc51584c3fe87496e54f9837fcec9de0b0..9d3a13f1c96a7ce864554b78b9d9e0dbebfb3c5f 100644
--- a/src/core/xsl/entity_palette.xsl
+++ b/src/core/xsl/entity_palette.xsl
@@ -3,47 +3,37 @@
   <xsl:output method="html"/>
 
   <xsl:template match="/Response">
-    <div class="btn-group-vertical caosdb-v-editmode-btngroup">
-      <button type="button" class="btn btn-default caosdb-f-edit-panel-new-button new-property">Create new Property</button>
-      <button type="button" class="btn btn-default caosdb-f-edit-panel-new-button new-recordtype">Create new RecordType</button>
-    </div>
-    <div title="Drag and drop Properties from this panel to the Entities on the left." class="panel panel-default caosdb-v-editmode-existing">
-      <div class="panel-heading">
-        <h5>Existing Properties</h5>
+    <div title="Drag and drop Properties from this panel to the Entities on the left." class="caosdb-v-editmode-existing caosdb-f-edit-mode-existing d-none">
+      <div class="card-header">
+        <span class="card-title">Existing Properties</span>
       </div>
-      <div class="panel-body">
+      <div class="card">
         <div class="input-group" style="width: 100%;">
           <input class="form-control" placeholder="filter..." title="Type a name (full or partial)." oninput="edit_mode.filter('properties');" id="caosdb-f-filter-properties" type="text"/>
-          <span class="input-group-btn">
-            <button class="btn btn-default caosdb-f-edit-panel-new-button new-property caosdb-f-hide-on-empty-input" title="Create this Property." ><span class="glyphicon glyphicon-plus"></span></button>
-          </span>
         </div>
-        <ul class="caosdb-v-edit-list">
+        <ul class="caosdb-v-edit-list list-group">
           <xsl:apply-templates select="./Property"/>
         </ul>
       </div>
     </div>
-    <div title="Drag and drop RecordTypes from this panel to the Entities on the left." class="panel panel-default caosdb-v-editmode-existing">
-      <div class="panel-heading">
-        <h5>Existing RecordTypes</h5>
+    <div title="Drag and drop RecordTypes from this panel to the Entities on the left." class="caosdb-v-editmode-existing caosdb-f-edit-mode-existing d-none">
+      <div class="card-header">
+        <span class="card-title">Existing RecordTypes</span>
       </div>
-      <div class="panel-body">
+      <div class="card">
         <div class="input-group" style="width: 100%;">
           <input class="form-control" placeholder="filter..." title="Type a name (full or partial)." oninput="edit_mode.filter('recordtypes');" id="caosdb-f-filter-recordtypes" type="text"/>
-          <span class="input-group-btn">
-              <button class="btn btn-default caosdb-f-edit-panel-new-button new-recordtype caosdb-f-hide-on-empty-input" title="Create this RecordType"><span class="glyphicon glyphicon-plus"></span></button>
-          </span>
         </div>
-        <ul class="caosdb-v-edit-list">
+        <ul class="caosdb-v-edit-list list-group">
           <xsl:apply-templates select="./RecordType"/>
         </ul>
-      </div>
     </div>
+  </div>
   </xsl:template>
 
   <xsl:template match="RecordType">
     <xsl:if test="string-length(@name)>0">
-        <li class="caosdb-f-edit-drag list-group-item caosdb-v-edit-drag">
+        <li draggable="true" class="caosdb-f-edit-drag list-group-item caosdb-v-edit-drag">
         <xsl:attribute name="id">caosdb-f-edit-rt-<xsl:value-of select="@id"/></xsl:attribute>
         <xsl:value-of select="@name"/>
         </li>
@@ -62,7 +52,7 @@
           <!-- ignore unit property -->
       </xsl:when>
       <xsl:otherwise>
-        <li class="caosdb-f-edit-drag list-group-item caosdb-v-edit-drag">
+        <li draggable="true" class="caosdb-f-edit-drag list-group-item caosdb-v-edit-drag">
           <xsl:attribute name="id">caosdb-f-edit-p-<xsl:value-of select="@id"/></xsl:attribute>
           <xsl:value-of select="@name"/>
         </li>
diff --git a/src/core/xsl/filesystem.xsl b/src/core/xsl/filesystem.xsl
index 38a772209fb1e199cee8a81a3f02ac1cf7a5da44..a924900091ca2f2c2b00ed698e144c62d27511d6 100644
--- a/src/core/xsl/filesystem.xsl
+++ b/src/core/xsl/filesystem.xsl
@@ -69,7 +69,7 @@
         <xsl:attribute name="href">
           <xsl:value-of select="concat(/Response/dir/@url, @name)"/>
         </xsl:attribute>
-        <span class="glyphicon"></span>
+        <i class="bi-folder2 me-1"></i>
         <xsl:value-of select="@name"/>
       </a>
     </li>
@@ -83,17 +83,17 @@
             <xsl:attribute name="href">
               <xsl:value-of select="$file-uri"/>
             </xsl:attribute>
-            <span class="glyphicon"></span>
+            <i class="bi-file-arrow-down me-1"></i>
             <xsl:value-of select="@name"/>
           </a>
         </div>
-        <div class="col-sm-6 text-right">
+        <div class="col-sm-6 text-end">
           <a class="btn caosdb-fs-btn-file">
             <xsl:attribute name="href">
               <xsl:value-of select="concat($entitypath, @id)"/>
             </xsl:attribute>
-            <span class="label caosdb-label-file">F</span>
-            <span class="label caosdb-id hidden">
+            <span class="badge caosdb-label-file">F</span>
+            <span class="badge caosdb-id invisible">
               <xsl:value-of select="@id"/>
             </span>
           </a>
@@ -106,9 +106,9 @@
   </xsl:template>
   <xsl:template match="/Response/dir" mode="top-level-data">
     <div class="container">
-      <div class="panel-group">
-        <div class="panel panel-default">
-          <div class="panel-heading">
+      <div>
+        <div class="card" id="caosdb-f-filesystem">
+          <div class="card-header">
             <div class="row">
               <div class="col-sm-8">
                 <a title="Go back to the root of the file system.">
@@ -119,13 +119,13 @@
                 </a>
                 <xsl:call-template name="filesystem-cwd"/>
               </div>
-              <div class="col-sm-4 text-right">
+              <div class="col-sm-4 text-end">
                 <xsl:value-of select="count(dir)"/> Directories and
                         <xsl:value-of select="count(file)"/> Files
                       </div>
             </div>
           </div>
-          <div class="panel-body">
+          <div class="card-body">
             <ul class="list-group">
               <xsl:apply-templates mode="filesystem-item" select="dir"/>
               <xsl:apply-templates mode="filesystem-item" select="file"/>
diff --git a/src/core/xsl/footer.xsl b/src/core/xsl/footer.xsl
index 0b034e9d5a3b170305b85567f34732ac04755f91..0231649d4ff4deda68822eecf25576175a5eed00 100644
--- a/src/core/xsl/footer.xsl
+++ b/src/core/xsl/footer.xsl
@@ -26,20 +26,24 @@
   <xsl:output method="html"/>
 
   <xsl:template name="caosdb-footer">
-    <div class="caosdb-footer-element" id="caosdb-footer-element-custom-1">
-      ${BUILD_FOOTER_CUSTOM_ELEMENT_ONE}
+    <div class="container d-flex flex-lg-row flex-column justify-content-around">
+      <div class="caosdb-footer-element" id="caosdb-footer-element-custom-1">
+        ${BUILD_FOOTER_CUSTOM_ELEMENT_ONE}
+      </div>
+      <div class="caosdb-footer-element" id="caosdb-footer-element-custom-2">
+        ${BUILD_FOOTER_CUSTOM_ELEMENT_TWO}
+      </div>
     </div>
-    <div class="caosdb-footer-element" id="AGPL-notice">
-      This server runs free software licensed under the <a
-      href="https://www.gnu.org/licenses/agpl-3.0.en.html"
-      target="_blank">AGPL-v3</a>, you can obtain the sources <a
-      href="https://gitlab.com/caosdb" target="_blank">here</a>.
-    </div>
-    <div class="caosdb-footer-element" id="caosdb-footer-element-custom-2">
-      ${BUILD_FOOTER_CUSTOM_ELEMENT_TWO}
-    </div>
-    <div class="caosdb-footer-element">
-      <a href="${BUILD_FOOTER_DATA_POLICY_HREF}">Data Policy</a><span class="caosdb-bulletsep">•</span><a href="/webinterface/${BUILD_NUMBER}/html/imprint.html">Imprint/Impressum</a>
+    <div class="container d-flex flex-md-row flex-column justify-content-center">
+      <a href="mailto:info@indiscale.com">Contact</a>
+      <span class="caosdb-bulletsep d-none d-md-inline">•</span>
+      <a href="https://www.indiscale.com/imprint/">Imprint/Impressum</a>
+      <span class="caosdb-bulletsep d-none d-md-inline">•</span>
+      <a href="${BUILD_FOOTER_DATA_POLICY_HREF}">Data Policy</a>
+      <span class="caosdb-bulletsep d-none d-md-inline">•</span>
+      <a href="https://www.gnu.org/licenses/agpl-3.0.en.html" target="_blank">License (AGPL-v3)</a>
+      <span class="caosdb-bulletsep d-none d-md-inline">•</span>
+      <a href="https://gitlab.com/caosdb" target="_blank">Sources</a>
     </div>
   </xsl:template>
 </xsl:stylesheet>
diff --git a/src/core/xsl/main.xsl b/src/core/xsl/main.xsl
index 69a2d83e2e4111beb457daf1a37dce21e3e4d0ef..1a0bdb812afb18ad6ab291acb975de994c5d3e47 100644
--- a/src/core/xsl/main.xsl
+++ b/src/core/xsl/main.xsl
@@ -85,207 +85,17 @@
         <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/css/bootstrap-select.css')"/>
       </xsl:attribute>
     </xsl:element>
-    <!--CSS_EXTENSIONS-->
-  </xsl:template>
-  <xsl:template name="caosdb-head-js">
-    <script>
-        var caosdb_webui_build_number = "${BUILD_NUMBER}";
-        window.sessionStorage.caosdbBasePath = "<xsl:value-of select="$basepath"/>";
-    </script>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/jquery.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/bootstrap.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/bootstrap-autocomplete.min.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/bootstrap-select.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/state-machine.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/showdown.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/dropzone.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/loglevel.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/plotly.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/webcaosdb.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/pako.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/utif.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <script>
-      $(document).ready(() => paging.initPaging(window.location.href, <xsl:value-of select="/Response/@count"/> ));
-    </script>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/caosdb.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/form_elements.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_autocomplete.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/preview.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_references.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_table_preview.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_xls_download.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/query_shortcuts.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_jupyterdrag.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/annotation.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/edit_mode.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_entity_state.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_file_download.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/leaflet.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/leaflet-graticule.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/leaflet-latlng-graticule.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/leaflet-coordinates.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/proj4.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/proj4leaflet.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_map.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/tour.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_bottom_line.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_sss_markdown.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_trigger_crawler_form.js')"/>
-      </xsl:attribute>
-    </xsl:element>
-    <xsl:element name="script">
-      <xsl:attribute name="src">
-        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/js/ext_bookmarks.js')"/>
+    <xsl:element name="link">
+      <xsl:attribute name="rel">stylesheet</xsl:attribute>
+      <xsl:attribute name="href">
+        <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/css/bootstrap-icons.css')"/>
       </xsl:attribute>
     </xsl:element>
-    <!--JS_EXTENSIONS-->
+    <!--CSS_EXTENSIONS-->
   </xsl:template>
   <xsl:template name="caosdb-data-container">
-    <div class="container caosdb-f-main">
-      <div class="row caosdb-v-main-col">
-        <div class="panel-group caosdb-f-main-entities">
+    <div class="container d-flex flex-column-reverse flex-lg-row caosdb-f-main">
+        <div class="flex-grow-1 caosdb-f-main-entities">
           <xsl:call-template name="paging-panel"/>
           <xsl:apply-templates select="/Response/UserInfo"/>
           <xsl:apply-templates mode="top-level-data" select="/Response/*"/>
@@ -293,23 +103,27 @@
           <xsl:if test="not(/Response/Query/Selection)">
             <xsl:apply-templates mode="entities" select="/Response/*"/>
           </xsl:if>
-          <xsl:if test="count(/Response/*)&lt;3 and not(/Response/Error|/Response/Info|/Response/Warning)">
-            <xsl:call-template name="welcome"/>
-          </xsl:if>
           <xsl:call-template name="paging-panel"/>
         </div>
-      </div>
-      <div class="panel panel-warning caosdb-f-edit caosdb-v-edit-panel caosdb-v-edit-panel hidden">
-        <div class="panel-heading">
-          <h3 class="panel-title">Edit Mode Toolbox</h3>
+        <div class="caosdb-f-edit ms-2">
+          <div class="card caosdb-v-edit-panel">
+            <div class="card-header">
+              <span class="card-title">Edit Mode Toolbox</span>
+            </div>
+            <div class="caosdb-f-edit-panel-body">
+              <div class="list-group list-group-flush">
+              <div class="list-group-item btn-group-vertical caosdb-v-editmode-btngroup caosdb-f-edit-mode-create-buttons">
+                <button type="button" class="btn btn-secondary caosdb-f-edit-panel-new-button new-property">Create Property</button>
+                <button type="button" class="btn btn-secondary caosdb-f-edit-panel-new-button new-recordtype">Create RecordType</button>
+              </div>
+              </div>
+            </div>
+          </div>
         </div>
-        <div class="caosdb-f-edit-panel-body panel-body"></div>
-      </div>
     </div>
   </xsl:template>
   <xsl:template match="*" mode="entities"/>
   <xsl:template match="*" mode="top-level-data"/>
-  <xsl:variable name="close-char" select="'×'"/>
   <!-- assure that this uri ends with a '/' -->
   <xsl:template name="uri_ends_with_slash">
     <xsl:param name="uri"/>
diff --git a/src/core/xsl/messages.xsl b/src/core/xsl/messages.xsl
index 1ac2e7b63c16bd389e9a6e0fe0c2f9541be34683..42035c9942652c78714b46e0d99b2b8138b0eb3c 100644
--- a/src/core/xsl/messages.xsl
+++ b/src/core/xsl/messages.xsl
@@ -27,9 +27,8 @@
     <xsl:param name="class"/>
     <div>
       <xsl:attribute name="class">alert caosdb-v-server-message
-                <xsl:value-of select="$class"/> alert-dismissable fade in</xsl:attribute>
-      <a class="close" data-dismiss="alert" href="#">
-        <xsl:value-of select="$close-char"/>
+                <xsl:value-of select="$class"/> alert-dismissable</xsl:attribute>
+      <a class="btn-close me-3" data-bs-dismiss="alert" href="#">
       </a>
       <strong>
         <xsl:value-of select="name()"/>
@@ -42,13 +41,13 @@
   </xsl:template>
   <xsl:template match="script" mode="entities">
     <div class="container" id="caosdb-container-script">
-      <div class="panel panel-default">
-        <div class="panel-heading">
+      <div class="card">
+        <div class="card-header">
           <div class="row">
             <div class="col-sm-8" id="caosdb-caption-script">
                 Output of the Script
               </div>
-            <div class="col-sm-4 text-right">
+            <div class="col-sm-4 text-end">
                 Code: <span id="caosdb-return-code"><xsl:value-of select="@code"/></span></div>
           </div>
         </div>
@@ -58,16 +57,16 @@
     </div>
   </xsl:template>
   <xsl:template match="stderr">
-    <div class="panel panel-default" id="caosdb-container-stderr">
-      <div class="panel-heading" id="caosdb-caption-stderr">Errors:</div>
+    <div class="card" id="caosdb-container-stderr">
+      <div class="card-header" id="caosdb-caption-stderr">Errors:</div>
       <div class="alert" id="caosdb-stderr">
         <xsl:value-of select="text()"/>
       </div>
     </div>
   </xsl:template>
   <xsl:template match="stdout">
-    <div class="panel panel-default" id="caosdb-container-stdout">
-      <div class="panel-heading" id="caosdb-caption-stdout">Standard Messages:</div>
+    <div class="card" id="caosdb-container-stdout">
+      <div class="card-header" id="caosdb-caption-stdout">Standard Messages:</div>
       <div id="caosdb-stdout">
         <xsl:value-of select="text()"/>
       </div>
diff --git a/src/core/xsl/navbar.xsl b/src/core/xsl/navbar.xsl
index 61bc6041ac804488635d087ff426392cbc339668..ee4df81be60558e6b6aa2e558096d7420636349f 100644
--- a/src/core/xsl/navbar.xsl
+++ b/src/core/xsl/navbar.xsl
@@ -30,7 +30,7 @@
     <xsl:param name="display"/>
     <xsl:param name="paging" select="'0L10'"/>
     <li>
-      <a>
+      <a class="dropdown-item">
         <xsl:attribute name="href">
           <xsl:value-of select="concat($entitypath, '?all=', normalize-space($entity))"/>
           <xsl:if test="$paging">
@@ -42,128 +42,116 @@
     </li>
   </xsl:template>
   <xsl:template name="caosdb-top-navbar">
-    <!-- Some general settings first, current context should be the <body> node. -->
-    <xsl:if test="count(/Response/*)&lt;2 and not(/Response/Error|/Response/Info|/Response/Warning)">
-        <xsl:attribute name="class">caosdb-welcome</xsl:attribute>
-    </xsl:if>
     <xsl:if test="/Response/@realm='${BUILD_MODULE_USER_MANAGEMENT_CHANGE_OWN_PASSWORD_REALM}'">
       <xsl:call-template name="change-password-modal">
           <xsl:with-param name="realm"><xsl:value-of select="/Response/@realm"/></xsl:with-param>
           <xsl:with-param name="username"><xsl:value-of select="/Response/@username"/></xsl:with-param>
       </xsl:call-template>
     </xsl:if>
-    <!-- Now the header follows. -->
-    <nav class="navbar navbar-default navbar-fixed-top">
+    <nav class="navbar navbar-expand-lg navbar-light bg-light sticky-top mb-2 flex-column">
       <noscript>Please enable JavaScript!</noscript>
       <div class="container-fluid">
-        <div class="navbar-header">
-          <button class="navbar-toggle" data-target="#top-navbar" data-toggle="collapse" type="button">
-            <span class="icon-bar"></span>
-            <span class="icon-bar"></span>
-            <span class="icon-bar"></span>
-          </button>
-          <a class="navbar-brand" href="/">
-            <xsl:element name="img">
-              <xsl:if test="'${BUILD_NAVBAR_BRAND_NAME}' != ''">
-                <xsl:attribute name="class">caosdb-logo</xsl:attribute>
-              </xsl:if>
-              <xsl:attribute name="src">
-                  <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/${BUILD_NAVBAR_LOGO}')"/>
-              </xsl:attribute>
-            </xsl:element>
-            ${BUILD_NAVBAR_BRAND_NAME}
-          </a>
-        </div>
+        <a class="navbar-brand" href="/">
+          <xsl:element name="img">
+            <xsl:if test="'${BUILD_NAVBAR_BRAND_NAME}' != ''">
+              <xsl:attribute name="class">caosdb-logo</xsl:attribute>
+            </xsl:if>
+            <xsl:attribute name="src">
+                <xsl:value-of select="concat($basepath,'webinterface/${BUILD_NUMBER}/${BUILD_NAVBAR_LOGO}')"/>
+            </xsl:attribute>
+          </xsl:element>
+          ${BUILD_NAVBAR_BRAND_NAME}
+        </a>
+        <button class="navbar-toggler" data-bs-target="#top-navbar" data-bs-toggle="collapse" type="button" aria-controls="top-navbar" aria-expanded="false" aria-label="Toggle navigation">
+          <span class="navbar-toggler-icon"></span>
+        </button>
         <div class="collapse navbar-collapse" id="top-navbar">
-          <xsl:if test="/Response/UserInfo">
-            <ul class="nav navbar-nav caosdb-navbar">
-              <li class="dropdown" id="caosdb-navbar-entities">
-                <a class="dropdown-toggle" data-toggle="dropdown" href="#">
-                                Entities
-                                <span class="caret"></span></a>
-                <ul class="dropdown-menu">
-                  <li class="dropdown-header">Retrieve all:</li>
-                  <xsl:call-template name="make-retrieve-all-link">
-                    <xsl:with-param name="entity">
-                                        Entity
-                                    </xsl:with-param>
-                    <xsl:with-param name="display">
-                                        Entities
-                                    </xsl:with-param>
-                  </xsl:call-template>
-                  <xsl:call-template name="make-retrieve-all-link">
-                    <xsl:with-param name="entity">
-                                        Record
-                                    </xsl:with-param>
-                    <xsl:with-param name="display">
-                                        Records
-                                    </xsl:with-param>
-                  </xsl:call-template>
-                  <xsl:call-template name="make-retrieve-all-link">
-                    <xsl:with-param name="entity">
-                                        RecordType
-                                    </xsl:with-param>
-                    <xsl:with-param name="display">
-                                        RecordTypes
-                                    </xsl:with-param>
-                  </xsl:call-template>
-                  <xsl:call-template name="make-retrieve-all-link">
-                    <xsl:with-param name="entity">
-                                        Property
-                                    </xsl:with-param>
-                    <xsl:with-param name="display">
-                                        Properties
-                                    </xsl:with-param>
-                  </xsl:call-template>
-                  <xsl:call-template name="make-retrieve-all-link">
-                    <xsl:with-param name="entity">
-                                        File
-                                    </xsl:with-param>
-                    <xsl:with-param name="display">
-                                        Files
-                                    </xsl:with-param>
-                  </xsl:call-template>
-                </ul>
-              </li>
-              <li id="caosdb-navbar-filesystem">
+          <ul class="navbar-nav caosdb-navbar me-auto">
+            <li class="nav-item dropdown" id="caosdb-navbar-entities">
+              <a class="nav-link dropdown-toggle" role="button" id="navbarEntitiesMenuLink" data-bs-toggle="dropdown" aria-expanded="false" href="#">
+                Entities
+              </a>
+              <ul class="dropdown-menu dropdown-menu-light" aria-labelledby="navbarEntitiesMenuLink">
+                <li class="dropdown-header">Retrieve all:</li>
+                <xsl:call-template name="make-retrieve-all-link">
+                  <xsl:with-param name="entity">
+                                      Entity
+                                  </xsl:with-param>
+                  <xsl:with-param name="display">
+                                      Entities
+                                  </xsl:with-param>
+                </xsl:call-template>
+                <xsl:call-template name="make-retrieve-all-link">
+                  <xsl:with-param name="entity">
+                                      Record
+                                  </xsl:with-param>
+                  <xsl:with-param name="display">
+                                      Records
+                                  </xsl:with-param>
+                </xsl:call-template>
+                <xsl:call-template name="make-retrieve-all-link">
+                  <xsl:with-param name="entity">
+                                      RecordType
+                                  </xsl:with-param>
+                  <xsl:with-param name="display">
+                                      RecordTypes
+                                  </xsl:with-param>
+                </xsl:call-template>
+                <xsl:call-template name="make-retrieve-all-link">
+                  <xsl:with-param name="entity">
+                                      Property
+                                  </xsl:with-param>
+                  <xsl:with-param name="display">
+                                      Properties
+                                  </xsl:with-param>
+                </xsl:call-template>
+                <xsl:call-template name="make-retrieve-all-link">
+                  <xsl:with-param name="entity">
+                                      File
+                                  </xsl:with-param>
+                  <xsl:with-param name="display">
+                                      Files
+                                  </xsl:with-param>
+                </xsl:call-template>
+              </ul>
+            </li>
+            <li id="caosdb-navbar-filesystem" class="nav-item">
+              <a class="nav-link" role="button">
                 <xsl:call-template name="make-filesystem-link">
                   <xsl:with-param name="href" select="'/'"/>
                   <xsl:with-param name="display" select="'File System'"/>
                 </xsl:call-template>
-              </li>
-              <li id="caosdb-navbar-query">
-                <button class="navbar-btn btn btn-link" data-target="#caosdb-query-panel" data-toggle="collapse">
-                                Query
-                            </button>
-              </li>
-            </ul>
-          </xsl:if>
-          <ul class="nav navbar-nav navbar-right">
-            <li class="dropdown">
-              <a class="dropdown-toggle" data-toggle="dropdown" href="#">
-                <span id="caosdb-f-bookmarks-collection-counter" class="badge">0</span>
+              </a>
+            </li>
+            <li id="caosdb-navbar-query" class="nav-item">
+              <a class="nav-link" role="button" data-bs-target="#caosdb-query-panel-collapsible" data-bs-toggle="collapse">
+                Query
+              </a>
+            </li>
+          </ul>
+          <ul class="navbar-nav">
+            <li class="nav-item dropdown">
+              <a class="nav-link dropdown-toggle" role="button" id="navbarBookmarkMenuLink" data-bs-toggle="dropdown" aria-expanded="false" href="#">
+                <span id="caosdb-f-bookmarks-collection-counter" class="badge bg-secondary">0</span>
                   Bookmarks
-                <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+                </a>
+              <ul class="dropdown-menu dropdown-menu-light" aria-labelledby="navbarBookmarkMenuLink">
                 <li class="disabled" id="caosdb-f-bookmarks-collection-link"
                     title="Show all bookmarked entities.">
-                  <a>Show all</a></li>
+                  <a class="dropdown-item">Show all</a></li>
                 <li class="disabled" id="caosdb-f-bookmarks-export-link"
                     title="Export all bookmarks to a file. The exported file is a spread sheet with columns for the id, the version, the complete URI of the bookmarked entities and the path, if the entity is a file.">
-                  <a>Export to file</a></li>
+                  <a class="dropdown-item">Export to file</a></li>
                 <li class="disabled" id="caosdb-f-bookmarks-clear"
                     title="Empty the list of bookmarks.">
-                  <a>Clear</a></li>
+                  <a class="dropdown-item">Clear</a></li>
               </ul>
             </li>
-            <xsl:call-template name="caosdb-user-menu"/>
+          <xsl:call-template name="caosdb-user-menu"/>
           </ul>
-        </div>
-        <!-- query panel -->
-        <div class="collapse" id="caosdb-query-panel">
-          <xsl:call-template name="caosdb-query-panel"/>
-        </div>
       </div>
+      </div>
+      <!-- global messages -->
       <xsl:apply-templates select="/Response/Error">
         <xsl:with-param name="class" select="'alert-danger'"/>
       </xsl:apply-templates>
@@ -173,8 +161,13 @@
       <xsl:apply-templates select="/Response/Info">
         <xsl:with-param name="class" select="'alert-info'"/>
       </xsl:apply-templates>
+      <!-- query panel -->
+      <div class="collapse" id="caosdb-query-panel-collapsible" style="width: 100%">
+      <div class="container py-2 py-sm-3 py-lg-4 py-xl-5 flex-column caosdb-query-panel" id="caosdb-query-panel">
+        <xsl:call-template name="caosdb-query-panel"/>
+      </div>
+      </div>
     </nav>
-    <div class="container" id="subnav"/>
   </xsl:template>
   <xsl:template match="Role" name="caosdb-user-roles">
     <div class="caosdb-user-role">
@@ -235,54 +228,57 @@
   <xsl:template name="caosdb-user-menu">
     <xsl:choose>
       <xsl:when test="/Response/@username">
-        <li class="dropdown" id="user-menu">
-          <a class="dropdown-toggle" data-toggle="dropdown" href="#">
+        <li class="nav-item dropdown my-auto" id="user-menu">
+          <a class="nav-link dropdown-toggle" role="button" data-bs-toggle="dropdown" href="#">
             <xsl:value-of select="concat(/Response/@username,' ')"/>
-            <span class="glyphicon glyphicon-user"/>
+            <i class="bi-person-fill"></i>
             <span class="caret"></span>
           </a>
-          <ul class="dropdown-menu">
+          <ul class="dropdown-menu dropdown-menu-light">
             <xsl:if test="/Response/@realm='${BUILD_MODULE_USER_MANAGEMENT_CHANGE_OWN_PASSWORD_REALM}'">
               <li>
                 <a title="Change your password." href="#" data-toggle="modal" data-target="#caosdb-f-change-password-form">Change Password</a>
               </li>
             </xsl:if>
             <li>
-              <a title="Click to logout.">
+              <a class="dropdown-item" title="Click to logout.">
                 <xsl:attribute name="href">
                   <xsl:value-of select="concat($basepath, 'logout')"/>
                 </xsl:attribute>
-                                Logout
-                                <span class="glyphicon glyphicon-log-out"/></a>
+                Logout <i class="bi-box-arrow-right"></i></a>
             </li>
           </ul>
         </li>
       </xsl:when>
       <xsl:otherwise>
-        <li id="user-menu">
-          <form id="caosdb-f-login-form" class="navbar-form visible-xs-inline-block" method="POST">
+        <li id="user-menu" class="nav-item my-auto">
+          <form id="caosdb-f-login-form" class="d-none" method="POST">
             <xsl:attribute name="action">
               <xsl:value-of select="concat($basepath, 'login')"/>
             </xsl:attribute>
+            <div class="row">
+            <div class="col">
             <input class="form-control" id="username" name="username" placeholder="username" type="text"/>
+            </div>
+            <div class="col">
             <input class="form-control" id="password" name="password" placeholder="password" type="password"/>
+            </div>
+            <div class="col-auto">
             <button class="btn btn-primary" type="submit">Login</button>
+            </div>
+            </div>
+          </form>
+          <form class="my-auto">
+          <button style="margin-right: 15px" class="btn btn-secondary navbar-btn d-inline-block" id="caosdb-f-login-show-button" type="button">Login</button>
           </form>
-          <button style="margin-right: 15px" class="btn btn-default navbar-btn hidden-xs" id="caosdb-f-login-show-button" type="button">Login</button>
         </li>
       </xsl:otherwise>
     </xsl:choose>
   </xsl:template>
   <xsl:template name="paging-panel">
-    <div class="container caosdb-paging-panel" style="display: none">
-      <ul class="pager">
-        <li class="previous">
-          <a class="caosdb-prev-button">Previous Page</a>
-        </li>
-        <li class="next">
-          <a class="caosdb-next-button">Next Page</a>
-        </li>
-      </ul>
+    <div class="caosdb-f-paging-panel mb-2">
+      <a type="button" class="caosdb-prev-button btn btn-light">Previous Page</a>
+      <a type="button" class="caosdb-next-button btn btn-light">Next Page</a>
     </div>
   </xsl:template>
 </xsl:stylesheet>
diff --git a/src/core/xsl/parent.xsl b/src/core/xsl/parent.xsl
index 12345d584248333a373f7150a19b44a8b542be29..9dd032b3a9d238e943f3be5e4f0e81a7c6b0d6e7 100644
--- a/src/core/xsl/parent.xsl
+++ b/src/core/xsl/parent.xsl
@@ -27,18 +27,18 @@
       <xsl:apply-templates select="./RecordType"/>
   </xsl:template>
   <xsl:template match="RecordType">
-      <span class="caosdb-parent-item small">
-		<xsl:attribute name="id">
-		<xsl:value-of select="generate-id()"/>
-		</xsl:attribute>
-		<span class="caosdb-f-parent-actions-panel">
-		</span>
-		<a class="caosdb-parent-name">
-			<xsl:attribute name="href">
-				<xsl:value-of select="concat($entitypath, @id)"/>
-			</xsl:attribute>
-			<xsl:value-of select="@name"/>
-		</a>
+      <span class="badge caosdb-parent-item me-1">
+    <xsl:attribute name="id">
+    <xsl:value-of select="generate-id()"/>
+    </xsl:attribute>
+    <span class="caosdb-f-parent-actions-panel">
+    </span>
+    <a class="caosdb-parent-name">
+      <xsl:attribute name="href">
+        <xsl:value-of select="concat($entitypath, @id)"/>
+      </xsl:attribute>
+      <xsl:value-of select="@name"/>
+    </a>
       </span>
   </xsl:template>
 </xsl:stylesheet>
diff --git a/src/core/xsl/query.xsl b/src/core/xsl/query.xsl
index 44d1c1bd6cff8f4b22138c1287af15713069ed79..2b647c07bebe7f7cd72198baf27e45318e25a18e 100644
--- a/src/core/xsl/query.xsl
+++ b/src/core/xsl/query.xsl
@@ -29,7 +29,7 @@
     <xsl:apply-templates select="ParsingError"/>
   </xsl:template>
   <xsl:template match="ParseTree/ParsingError" mode="query-results">
-    <div class="panel-body">
+    <div class="card-body">
       <div class="caosdb-overflow-box">
         <div class="caosdb-overflow-content">
           <span>ParseTree:</span>
@@ -50,8 +50,8 @@
     </div>
   </xsl:template>
   <xsl:template match="Query" mode="query-results">
-    <div class="panel panel-default caosdb-query-response">
-      <div class="panel-heading caosdb-query-response-heading">
+    <div class="card caosdb-query-response mb-2">
+      <div class="card-header caosdb-query-response-heading">
         <div class="row">
           <div class="col-sm-10 caosdb-overflow-box">
             <div class="caosdb-overflow-content">
@@ -59,7 +59,7 @@
               <xsl:value-of select="@string"/>
             </div>
           </div>
-          <div class="col-sm-2 text-right">
+          <div class="col-sm-2 text-end">
             <span>Results: </span>
             <span class="caosdb-query-response-results">
               <xsl:value-of select="@results"/>
@@ -68,7 +68,7 @@
         </div>
       </div>
       <xsl:if test="@results=0">
-        <div class="panel panel-default caosdb-no-results">
+        <div class="card caosdb-no-results">
           <div class="alert alert-warning" role="alert">
                 There were no results for this query.
               </div>
@@ -81,36 +81,36 @@
     </xsl:if>
   </xsl:template>
   <xsl:template match="Selection" mode="select-table">
-    <div class="panel panel-default caosdb-select-table">
-      <div class="panel-heading">
+    <div class="card caosdb-select-table">
+      <div class="card-header">
         <div class="container-fluid panel-container">
           <div class="col-xs-6">
             <h5>Table of selected fields</h5>
           </div>
-          <div class="col-xs-6 text-right">
+          <div class="col-xs-6 text-end">
             <!-- Trigger the modal with a button -->
-            <button class="btn btn-info btn-sm caosdb-v-btn-select" data-target="#downloadModal" data-toggle="modal" type="button">Export</button>
+            <button class="btn btn-info btn-sm caosdb-v-btn-select" data-bs-target="#downloadModal" data-bs-toggle="modal" type="button">Export</button>
             <!-- Modal -->
             <div class="modal fade text-left" id="downloadModal" role="dialog">
               <div class="modal-dialog">
                 <!-- Modal content-->
                 <div class="modal-content">
-                  <div class="modal-header">
-                    <button class="close" data-dismiss="modal" type="button">×</button>
-                    <h4 class="modal-title">Download this table</h4>
+                  <div class="modal-header align-middle">
+                      <h4 class="modal-title">Download this table</h4>
+                    <button class="btn-close" data-bs-dismiss="modal" type="button"></button>
                   </div>
-                  <div class="modal-body">
+                  <div class="modal-body text-start">
                     <p>
                       <a id="caosdb-f-query-select-data-tsv" onclick="downloadTSV(this)" href="#selected_data.tsv" download="selected_data.tsv">
                         Download table as TSV File
                       </a>
-                      <span class="checkbox" style="margin-top: 0; display: inline; position: absolute; right: 10px"><label><input type="checkbox" name="raw" id="caosdb-table-export-raw-flag-tsv" title="Export raw entity ids instead of the visible page content."/>raw</label></span>
+                      <span class="form-check" style="margin-top: 0; display: inline; position: absolute; right: 1rem"><label><input type="checkbox" class="me-1" name="raw" id="caosdb-table-export-raw-flag-tsv" title="Export raw entity ids instead of the visible page content."/>raw</label></span>
                     </p>
                     <p>
                       <a class="caosdb-v-query-select-data-xsl" onclick="downloadXLS(this)" href="#selected_data.xsl" download="">
                         Download table as XLS File
                       </a>
-                      <span class="checkbox" style="margin-top: 0; display: inline; position: absolute; right: 10px"><label><input type="checkbox" name="raw" id="caosdb-table-export-raw-flag-xls" title="Export raw entity ids instead of the visible page content."/>raw</label></span>
+                      <span class="form-check" style="margin-top: 0; display: inline; position: absolute; right: 1rem"><label><input type="checkbox" class="me-1" name="raw" id="caosdb-table-export-raw-flag-xls" title="Export raw entity ids instead of the visible page content."/>raw</label></span>
                     </p>
                     <p>
                       <a id="caosdb-f-query-select-files" onclick="ext_file_download.download_files(this)" href="#selected_data.tsv" download="files.zip" title="Collects file entities listed in the table in a zip file. If the entity belonging to a row is a file entity, it will be included.">
@@ -132,7 +132,7 @@
                       <div class="col-xs-6 caosdb-f-modal-footer-left">
                       </div>
                       <div class="col-xs-6">
-                        <button class="btn btn-default" data-dismiss="modal" type="button">Close</button>
+                        <button class="btn btn-secondary" data-bs-dismiss="modal" type="button">Close</button>
                       </div>
                     </div>
                   </div>
@@ -142,31 +142,29 @@
           </div>
         </div>
       </div>
-      <div class="caosdb-select-table-actions-panel text-right btn-group-xs"></div>
-      <div class="panel-body">
-        <div class="table-responsive">
-          <table class="table table-hover">
-            <thead>
-              <tr>
-                <th></th>
-                <xsl:for-each select="Selector">
-                  <th>
-                    <xsl:value-of select="@name"/>
-                  </th>
-                </xsl:for-each>
-              </tr>
-            </thead>
-            <tbody>
-              <xsl:for-each select="/Response/*[@id]">
-                <xsl:call-template name="select-table-row">
-                  <xsl:with-param name="entity-id" select="@id"/>
-                  <xsl:with-param name="version-id" select="Version/@id"/>
-                  <xsl:with-param name="ishead" select="Version/@head"/>
-                </xsl:call-template>
+      <div class="caosdb-select-table-actions-panel text-end btn-group-sm"></div>
+      <div class="card-body">
+        <table class="table ttable-responsive able-hover">
+          <thead>
+            <tr>
+              <th></th>
+              <xsl:for-each select="Selector">
+                <th>
+                  <xsl:value-of select="@name"/>
+                </th>
               </xsl:for-each>
-            </tbody>
-          </table>
-        </div>
+            </tr>
+          </thead>
+          <tbody>
+            <xsl:for-each select="/Response/*[@id]">
+              <xsl:call-template name="select-table-row">
+                <xsl:with-param name="entity-id" select="@id"/>
+                <xsl:with-param name="version-id" select="Version/@id"/>
+                <xsl:with-param name="ishead" select="Version/@head"/>
+              </xsl:call-template>
+            </xsl:for-each>
+          </tbody>
+        </table>
       </div>
     </div>
   </xsl:template>
@@ -174,7 +172,7 @@
     <xsl:param name="entity-id"/>
     <xsl:param name="version-id"/>
     <xsl:param name="ishead"/>
-    <a class="btn btn-default btn-sm caosdb-select-id">
+    <a class="btn btn-secondary btn-sm caosdb-select-id" title="Go to this entity.">
       <xsl:attribute name="href">
         <xsl:value-of select="concat($entitypath, $entity-id)"/>
         <xsl:if test="$version-id and not($ishead)">
@@ -183,7 +181,7 @@
       </xsl:attribute>
       <!-- <xsl:value-of select="$entity-id" /> -->
       <span class="caosdb-select-id-target">
-        <span class="glyphicon glyphicon-new-window"/>
+          <i class="bi bi-box-arrow-up-right"></i>
       </span>
     </a>
   </xsl:template>
@@ -250,15 +248,17 @@
           <xsl:with-param name="value">
             <xsl:value-of select="@*[translate(name(), $uppercase, $lowercase)=$first-segment]"/>
           </xsl:with-param>
+          <xsl:with-param name="reference" select="'false'"/>
+          <xsl:with-param name="boolean" select="'false'"/>
         </xsl:call-template>
       </xsl:when>
 
       <xsl:when test="translate($first-segment, $uppercase, $lowercase)='version'">
         <!--handle version-->
         <xsl:call-template name="single-value">
-          <xsl:with-param name="value">
-            <xsl:value-of select="Version/@id"/>
-          </xsl:with-param>
+          <xsl:with-param name="value" select="Version/@id"/>
+          <xsl:with-param name="reference" select="'false'"/>
+          <xsl:with-param name="boolean" select="'false'"/>
         </xsl:call-template>
       </xsl:when>
 
@@ -270,9 +270,9 @@
       <xsl:when test="translate($next-segments, $uppercase, $lowercase)='unit'">
         <!--handle unit-->
         <xsl:call-template name="single-value">
-          <xsl:with-param name="value">
-            <xsl:value-of select="@unit"/>
-          </xsl:with-param>
+          <xsl:with-param name="value" select="@unit"/>
+          <xsl:with-param name="reference" select="'false'"/>
+          <xsl:with-param name="boolean" select="'false'"/>
         </xsl:call-template>
       </xsl:when>
 
@@ -307,24 +307,24 @@
           <xsl:with-param name="value">
             <xsl:value-of select="@*[translate(name(), $uppercase, $lowercase)=$first-segment]"/>
           </xsl:with-param>
+          <xsl:with-param name="reference" select="'false'"/>
+          <xsl:with-param name="boolean" select="'false'"/>
         </xsl:call-template>
       </xsl:when>
 
       <xsl:when test="translate($first-segment, $uppercase, $lowercase)='version'">
         <!--handle version-->
         <xsl:call-template name="single-value">
-          <xsl:with-param name="value">
-            <xsl:value-of select="Version/@id"/>
-          </xsl:with-param>
+          <xsl:with-param name="value" select="Version/@id"/>
+          <xsl:with-param name="reference" select="'false'"/>
+          <xsl:with-param name="boolean" select="'false'"/>
         </xsl:call-template>
       </xsl:when>
 
       <xsl:when test="$next-segments">
         <!-- when there is a next-segmenst -->
         <xsl:apply-templates select="Property[translate(@name, $uppercase, $lowercase)=$first-segment]" mode="walk-select-segments">
-          <xsl:with-param name="next-segments">
-            <xsl:value-of select="$next-segments"/>
-          </xsl:with-param>
+          <xsl:with-param name="next-segments" select="$next-segments"/>
         </xsl:apply-templates>
       </xsl:when>
 
@@ -338,21 +338,17 @@
 
   <xsl:template name="caosdb-query-panel">
     <!-- query panel, this is the area which contains the query form and other related stuff (e.g. query short cuts). -->
-    <div class="container caosdb-query-panel">
-      <form class="panel" id="caosdb-query-form" method="GET">
+      <form class="card caosdb-query-form" id="caosdb-query-form" method="GET">
         <xsl:attribute name="action">
           <xsl:value-of select="$entitypath"/>
         </xsl:attribute>
         <input id="caosdb-query-paging-input" name="P" type="hidden" value="0L10"/>
         <div class="input-group">
           <input class="form-control" id="caosdb-query-textarea" name="query" placeholder="E.g. 'FIND Experiment'" rows="1" style="resize: vertical;" type="text"></input>
-          <span class="input-group-addon btn btn-default caosdb-search-btn">
-            <a href="#" title="Click to execute the query.">
-              <span class="glyphicon glyphicon-search"></span>
+            <a class="btn btn-secondary caosdb-search-btn" href="#" title="Click to execute the query.">
+              <i class="bi-search"></i>
             </a>
-          </span>
         </div>
       </form>
-    </div>
   </xsl:template>
 </xsl:stylesheet>
diff --git a/src/core/xsl/welcome.xsl b/src/core/xsl/welcome.xsl
index 88b2a6e733b6f0726cae02a83c6e88579fdd1918..c3c80222492abaf243cbf227b143a9c13546a3f1 100644
--- a/src/core/xsl/welcome.xsl
+++ b/src/core/xsl/welcome.xsl
@@ -25,7 +25,7 @@
 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="html"/>
   <xsl:template name="welcome">
-    <div class="jumbotron caosdb-f-welcome-panel">
+    <div class="caosdb-v-welcome-panel bg-light container">
       <h1>Welcome</h1>
       <p>This is CaosDB.</p>
               <p>This is the default welcome message. If you are an administrator you can override it. Just copy <code>src/core/xsl/welcome.xsl</code> to <code>src/ext/xsl/welcome.xsl</code> and change this content. Then run <code>make</code> again in CaosdDB's web interface's root directory.</p>
diff --git a/src/doc/tutorials/change-entity.png b/src/doc/tutorials/change-entity.png
new file mode 100644
index 0000000000000000000000000000000000000000..ddae63fa841976709b2dcf98389e578d79998f03
Binary files /dev/null and b/src/doc/tutorials/change-entity.png differ
diff --git a/src/doc/tutorials/delete-entity-button.png b/src/doc/tutorials/delete-entity-button.png
new file mode 100644
index 0000000000000000000000000000000000000000..c118b8217a63d00eeee6469731d8561810a8d7d4
Binary files /dev/null and b/src/doc/tutorials/delete-entity-button.png differ
diff --git a/src/doc/tutorials/edit-entity-button.png b/src/doc/tutorials/edit-entity-button.png
new file mode 100644
index 0000000000000000000000000000000000000000..79003121df69cc615890589941079e766f970775
Binary files /dev/null and b/src/doc/tutorials/edit-entity-button.png differ
diff --git a/src/doc/tutorials/edit-mode-button.png b/src/doc/tutorials/edit-mode-button.png
new file mode 100644
index 0000000000000000000000000000000000000000..28dd167a5887be45d6c41581a4645e796c3b6328
Binary files /dev/null and b/src/doc/tutorials/edit-mode-button.png differ
diff --git a/src/doc/tutorials/edit-mode-toolbox.png b/src/doc/tutorials/edit-mode-toolbox.png
new file mode 100644
index 0000000000000000000000000000000000000000..e291c43a77e41adfa9f2b821d90f9982449c5f9f
Binary files /dev/null and b/src/doc/tutorials/edit-mode-toolbox.png differ
diff --git a/src/doc/tutorials/edit_mode.rst b/src/doc/tutorials/edit_mode.rst
new file mode 100644
index 0000000000000000000000000000000000000000..3e7d9ffb4472ab8ff0ec9a4539ab9ab11563ffd2
--- /dev/null
+++ b/src/doc/tutorials/edit_mode.rst
@@ -0,0 +1,185 @@
+The Edit Mode
+=============
+
+Entities in CaosDB can be changed, created, and deleted using the
+``Edit Mode``. In the following chapter, you'll learn how. You should
+be fairly familiar with the concepts of Records, RecordTypes and
+Properties in CaosDB. If you have doubts, please have a look at the
+`data model documentation
+<https://docs.indiscale.com/caosdb-server/Data-Model.html>`_.
+
+In usual setups of CaosDB, you have to log in to use the edit
+mode. Afterwards, you can access it by clicking on the button in the
+to panel as shown below:
+
+.. image:: edit-mode-button.png
+   :width: 480
+   :alt: Edit mode button
+
+After entering the edit mode, the button changes its text to ``Leave
+Edit Mode``. Unsurprisingly, clicking here terminates the edit mode.
+
+.. note::
+
+   The edit mode is only available if you have sufficient
+   privileges. You can only create/edit/delete entities if your user
+   is allowed to do that. User and group permissions can be configured
+   in detail as explained in the `server documentation
+   <https://docs.indiscale.com/caosdb-server/Permissions.html>`_.
+
+When you have entered the edit mode, you'll see the edit mode toolbox
+appearing on the right hand side of your screen:
+
+.. image:: edit-mode-toolbox.png
+   :width: 240
+   :alt: Edit mode toolbox
+
+You'll learn more about its contents in the following sections. Right
+now it only contains the options for creating a new RecordType or
+Property which we'll explain in :ref:`new_recordtypes_properties`.
+
+.. _change_existing:
+
+Changing an existing Entity
+---------------------------
+
+We'll start by changing and updating existing entities. First, find
+the entity you want to change and enter the edit mode. You'll see an
+edit button in the top right of the entity card:
+
+.. image:: edit-entity-button.png
+   :width: 240
+   :alt: Edit entity button
+
+After clicking on this button, the edit menu for this entity is opened
+as shown below for a guitar Record from the `demo
+<https://demo.indiscale.com>`_. You'll also note that the edit mode
+toolbox changes its contents: It now harbours two lists of the
+existing Properties and RecordTypes.
+
+.. image:: change-entity.png
+   :width: 720
+   :alt: Changing an existing Record
+
+Property values can be changed in the entity card directly; additional
+parents can be added by dragging them from the list of RecordTypes to
+the corresponding area at the top of the Record. Similarly, Properties
+can be added by dragging Properties (or RecordTypes) from the list in the edit mode toolbox
+to the corresponding area at the bottom of the Record. Properties and
+parents can be removed from the entity by clicking on the trash-can
+symbol. Not that a Record must always have at least one parent.
+
+Changes will be applied after clicking on ``Save`` or can be discarded
+entirely by clicking ``Cancel``. Existing Properties and RecordTypes
+can be edited in the same way. Note that when changing a RecordType,
+the properties don't have values.
+	 
+
+Creating a new Record
+---------------------
+
+If you want to create a new Record of a given RecordType, visit that
+RecordType and enter the edit mode (if your new Record will have more
+than one parent, visit any one of them - you can add the others
+later). A new Record is then created by clicking on the ``+Record``
+button in the top right of the RecordType:
+
+.. image:: new-record.png
+   :width: 240
+   :alt: New record button
+
+Clicking here opens an entity card with an edit menu for the new
+Record similar to the one discussed in :ref:`change_existing`. In
+here, you can enter the name and the description of your new Record,
+assign values to its properties, and add further parents or properties
+from the corresponding lists in the edit mode toolbox. The new Record
+is inserted by clicking ``Save``.
+
+.. _new_recordtypes_properties:
+
+Creating new RecordTypes and Properties
+---------------------------------------
+
+You can extend the data model of your CaosDB by creating new
+RecordTypes and Properties directly from the WebUI. This is done by
+clicking on the corresponding buttons in the edit mode toolbox:
+
+.. image:: edit-mode-toolbox.png
+   :width: 240
+   :alt: Edit mode toolbox
+
+When creating a new RecordType, a RecordType card is added to the
+entity panel, similar to the new Record explained above:
+
+.. image:: new-recordtype.png
+   :width: 720
+   :alt: Create a new RecordType
+
+As above, you can enter a name and a description. You can add parents
+and properties by selecting them from the lists in the edit mode
+toolbox and dragging them to the respective areas in the new
+RecordType. Note that in contrast to Records, the properties of
+RecordTypes do not have values.
+
+When creating a new property name and description can be entered as
+above. In addition, the `datatype` can be selected from the CaosDB
+datatypes ``TEXT``, ``DOUBLE``, ``INTEGER``, ``DATETIME``,
+``BOOLEAN``, ``FILE``, and ``REFERENCE``. See `here
+<https://docs.indiscale.com/caosdb-server/specification/Datatype.html>`_
+for more information on the datatypes. You can also choose whether the
+new property should have a single value or a list of values.
+
+.. image:: new-property.png
+   :width: 720
+   :alt: Create a new Property
+
+When creating a property with datatype ``INTEGER`` or ``DOUBLE``,
+i.e., a number, you may enter a unit in an additional input field if
+applicable. In case of a ``REFERENCE`` property, you may specify the
+RecordType that all referenced Records must have. In the above example
+a ``REFERENCE`` property is created which may only have violins as
+values. Again, the new entity is created by clicking on ``save``.
+
+.. note::
+
+   After having created a new RecordType or Property, you may have to
+   leave and re-enter the edit mode for the new entity to appear in
+   the lists of Properties or RecordTypes in the edit mode toolbox.
+
+Deleting an Entity
+------------------
+
+Entities can also be deleted by clicking on the delete button in the
+top right of the entity:
+
+.. image:: delete-entity-button.png
+   :width: 240
+   :alt: Delete entity button
+
+After clicking on ``delete`` you'll be asked for confirmation. Note that
+entities cannot be deleted if they are needed by other entities, e.g.,
+as a reference.
+
+
+Uploading files
+---------------
+
+In case of properties with data type ``FILE``, you can use the edit
+mode to upload a corresponding file directly. When editing the Record
+which will have the file to be uploaded as the value of the
+corresponding property (named ``SourceFile`` in the example below),
+add the property as described above if it isn't present already. Next
+to the dropdown menu, in which you can choose from existing files, you
+find an uploaded button:
+
+.. image:: file-upload.png
+   :width: 720
+   :alt: File upload button
+
+Click on it to open an upload dialogue in which you can choose the
+file that you want to upload. The files uploaded this way will be
+stored within ``/uploaded.by/<REALM>/<USER>/``.
+
+The same is true for properties with data type ``REFERENCE``, too. In
+that case, the Record of the file that is uploaded will be assigned the
+RecordType of value of the original reference property.
diff --git a/src/doc/tutorials/file-upload.png b/src/doc/tutorials/file-upload.png
new file mode 100644
index 0000000000000000000000000000000000000000..85c9224a6453cc219e7510b13fb1c5869f7c01c6
Binary files /dev/null and b/src/doc/tutorials/file-upload.png differ
diff --git a/src/doc/tutorials/index.rst b/src/doc/tutorials/index.rst
index dbfeafed2a09d587ebd538a62ed9002943b52aa0..b01e45e3d574cd675b8410da1dbd1d79cb8e20c0 100644
--- a/src/doc/tutorials/index.rst
+++ b/src/doc/tutorials/index.rst
@@ -8,4 +8,7 @@ This chapter contains the following tutorials:
    :maxdepth: 2
    :glob:
 
+   first_steps
+   query
+   edit_mode
    *
diff --git a/src/doc/tutorials/new-property.png b/src/doc/tutorials/new-property.png
new file mode 100644
index 0000000000000000000000000000000000000000..af438007278b2ddf30fae4f56fb803bfda06577f
Binary files /dev/null and b/src/doc/tutorials/new-property.png differ
diff --git a/src/doc/tutorials/new-record.png b/src/doc/tutorials/new-record.png
new file mode 100644
index 0000000000000000000000000000000000000000..0b2ac31afa78ca2aa20ee8f5f83f9a04ce39be30
Binary files /dev/null and b/src/doc/tutorials/new-record.png differ
diff --git a/src/doc/tutorials/new-recordtype.png b/src/doc/tutorials/new-recordtype.png
new file mode 100644
index 0000000000000000000000000000000000000000..9519a9ada3b034c01308ac4a4c350954d9d32d65
Binary files /dev/null and b/src/doc/tutorials/new-recordtype.png differ
diff --git a/src/ext/js/fileupload.js b/src/ext/js/fileupload.js
index 395da76adf977e5b534d6923e107f4261494a4c2..31d86589286f1761f481cc9d9bb6a557a63cbce1 100644
--- a/src/ext/js/fileupload.js
+++ b/src/ext/js/fileupload.js
@@ -25,18 +25,31 @@ var fileupload = new function() {
 
     // TODO * action to config * upload-path id -> class * message configurable
     // * style path input
-    const _modal_str = ` <div class="modal fade" tabindex="-1" role="dialog">
-    <div class="modal-dialog modal-lg" role="document"> <div
-    class="modal-content"> <div class="modal-header"> <button type="button"
-    class="close" data-dismiss="modal">&times;</button> <h4
-    class="modal-title">File Upload</h4> </div> <div class="modal-body"> <form
-    action="/Entity/" class="dropzone dz-clickable" > <label>path</label><input
-    id="upload-path" type="text" value="/"/> <div class="dz-message">
-    Drag'n'drop files to this area or click to upload.  </div> </form> </div>
-    <div class="modal-footer"> <button type="button" class="btn btn-default
-    caosdb-f-file-upload-submit-button">Ok</button> <button type="button"
-    class="btn btn-default" data-dismiss="modal">Close</button> </div> </div>
-    </div> </div>`;
+    const _modal_str = `
+<div class="modal fade" tabindex="-1" role="dialog">
+    <div class="modal-dialog modal-lg" role="document">
+        <div class="modal-content">
+            <div class="modal-header">
+                <h4 class="modal-title">File Upload</h4>
+                <button type="button" class="btn-close" data-bs-dismiss="modal">
+                </button>
+            </div>
+            <div class="modal-body">
+                <form action="/Entity/" class="dropzone dz-clickable" >
+                    <label>path</label>
+                    <input id="upload-path" type="text" value="/"/>
+                    <div class="dz-message">
+                        Drag'n'drop files to this area or click to upload.
+                    </div>
+                </form>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-secondary caosdb-f-file-upload-submit-button">Ok</button>
+                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
+            </div>
+        </div>
+    </div>
+</div>`;
 
     /** Create a dropzone.js form for the file upload.
      */
@@ -121,8 +134,8 @@ var fileupload = new function() {
                 // add error message
                 input.after(`<div class="alert alert-danger alert-dismissible"
     role="alert">
-    <button type="button" class="close" data-dismiss="alert"
-        aria-label="Close"><span aria-hidden="true">&times;</span></button>
+    <button type="button" class="btn-close" data-bs-dismiss="alert"
+        aria-label="Close"></button>
     <strong>Error!</strong> You are not logged in!.</div>`);
             } else {
                 globalError(event, error, xhr);
@@ -187,13 +200,13 @@ var fileupload = new function() {
             // add success message
             input.after(`<div class="alert alert-success alert-dismissible"
   role="alert">
-  <button type="button" class="close" data-dismiss="alert"
-    aria-label="Close"><span aria-hidden="true">&times;</span></button>
+  <button type="button" class="btn-close" data-bs-dismiss="alert"
+    aria-label="Close"></button>
   <strong>Success!</strong>
   The file <code class="caosdb-f-file-upload-file-name">` +
                 getEntityName(entity) + `</code> has been uploaded.</div>`);
 
-            input.after(`<a class="btn btn-default btn-sm"
+            input.after(`<a class="btn btn-secondary btn-sm"
   href="` + connection.getEntityUri([getEntityId(entity)]) + `" target= "_blank">` +
                 getEntityName(entity) + `</a>`);
 
@@ -206,7 +219,7 @@ var fileupload = new function() {
      * @return {HTMLElement} a button element.
      */
     this.create_small_icon_button = function() {
-        var button = $('<button class="caosdb-f-file-upload-button btn btn-link navbar-btn" ><span class="glyphicon glyphicon-upload" aria-hidden="true"></span></button>');
+        var button = $('<button class="caosdb-f-file-upload-button btn btn-link navbar-btn" ><i aria-hidden="true" class="bi-upload"></button>');
 
         return button[0];
     };
@@ -308,7 +321,7 @@ var fileupload = new function() {
             error_handler,
             atom_par);
         var toggle_function = function() {
-            $(modal).modal()
+            $(modal).modal("toggle");
         };
 
         this.add_file_upload_button(edit_menu, button, toggle_function);
diff --git a/src/linkahead_icon_512.png b/src/linkahead_icon_512.png
new file mode 100644
index 0000000000000000000000000000000000000000..84d1b5ebd715b55418444787c82689b28d917e24
Binary files /dev/null and b/src/linkahead_icon_512.png differ
diff --git a/test/core/html/form_elements_example_1.html b/test/core/html/form_elements_example_1.html
index 9977e5d91c02cc0e4dd08e9f0939c85f98c6c1be..27da98afdaffd44ac6560d72724e5e40d50655f0 100644
--- a/test/core/html/form_elements_example_1.html
+++ b/test/core/html/form_elements_example_1.html
@@ -3,8 +3,8 @@
        .caosdb-f-property-single-raw-value or introduce new 
        .caosdb-v-property-text-value -->
   <form action="#" class="form-horizontal" method="post" name="sample_creation.py">
-    <div class="form-group caosdb-f-field caosdb-f-entity-property caosdb-f-form-field-required caosdb-f-form-field-cached" data-field-name="ice_core" data-groups="(part1)">
-      <label class="control-label col-sm-3" data-property-name="ice_core" for="ice_core">Ice Core</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property caosdb-f-form-field-required caosdb-f-form-field-cached" data-field-name="ice_core" data-groups="(part1)">
+      <label class="col-form-label col-sm-3" data-property-name="ice_core" for="ice_core">Ice Core</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select form-control bs3">
           <select class="selectpicker form-control" name="ice_core" tabindex="-98" title="Nothing selected">
@@ -16,7 +16,7 @@
             <option value="6347">EGRIP18</option>
             <option value="6348">EGRIP19</option>
           </select>
-          <button aria-expanded="false" class="btn dropdown-toggle btn-default" data-toggle="dropdown" role="button" title="EGRIP15" type="button">
+          <button aria-expanded="false" class="btn dropdown-toggle btn-secondary" data-toggle="dropdown" role="button" title="EGRIP15" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">EGRIP15</div>
@@ -64,8 +64,8 @@
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="orig_sample_type" data-groups="(part1)">
-      <label class="control-label col-sm-3" data-property-name="orig_sample_type" for="orig_sample_type">Original Sample Type</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="orig_sample_type" data-groups="(part1)">
+      <label class="col-form-label col-sm-3" data-property-name="orig_sample_type" for="orig_sample_type">Original Sample Type</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select form-control bs3">
           <select class="selectpicker form-control" name="orig_sample_type" tabindex="-98" title="Nothing selected">
@@ -78,7 +78,7 @@
             <option value="6338">PP_Sample</option>
             <option value="6340">LASM_Sample</option>
           </select>
-          <button aria-expanded="false" class="btn dropdown-toggle btn-default" data-toggle="dropdown" role="button" title="IceSample" type="button">
+          <button aria-expanded="false" class="btn dropdown-toggle btn-secondary" data-toggle="dropdown" role="button" title="IceSample" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">IceSample</div>
@@ -131,8 +131,8 @@
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property caosdb-f-field-disabled" data-field-name="logging_protocol" data-groups="(part2)" style="display: none;">
-      <label class="control-label col-sm-3" data-property-name="logging_protocol" for="logging_protocol">Logging Protocol</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property caosdb-f-field-disabled" data-field-name="logging_protocol" data-groups="(part2)" style="display: none;">
+      <label class="col-form-label col-sm-3" data-property-name="logging_protocol" for="logging_protocol">Logging Protocol</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select form-control bs3">
           <select class="selectpicker form-control" name="logging_protocol" tabindex="-98" title="Nothing selected">
@@ -140,7 +140,7 @@
             <option disabled="disabled" selected="selected" style="display: none" value=""></option>
             <option value="6350">/logging_protocol_2019-06-15.pdf</option>
           </select>
-          <button class="btn dropdown-toggle btn-default bs-placeholder" data-toggle="dropdown" role="button" title="Nothing selected" type="button">
+          <button class="btn dropdown-toggle btn-secondary bs-placeholder" data-toggle="dropdown" role="button" title="Nothing selected" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">Nothing selected</div>
@@ -157,8 +157,8 @@
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="cutting_protocol" data-groups="(part3)" style="">
-      <label class="control-label col-sm-3" data-property-name="cutting_protocol" for="cutting_protocol">Cutting Protocol</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="cutting_protocol" data-groups="(part3)" style="">
+      <label class="col-form-label col-sm-3" data-property-name="cutting_protocol" for="cutting_protocol">Cutting Protocol</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select form-control bs3">
           <select class="selectpicker form-control" name="cutting_protocol" tabindex="-98" title="Nothing selected">
@@ -166,7 +166,7 @@
             <option disabled="disabled" selected="selected" style="display: none" value=""></option>
             <option value="6349">/cutting_protocol_2019-08-15.pdf</option>
           </select>
-          <button aria-expanded="false" class="btn dropdown-toggle btn-default" data-toggle="dropdown" role="button" title="/cutting_protocol_2019-08-15.pdf" type="button">
+          <button aria-expanded="false" class="btn dropdown-toggle btn-secondary" data-toggle="dropdown" role="button" title="/cutting_protocol_2019-08-15.pdf" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">/cutting_protocol_2019-08-15.pdf</div>
@@ -194,29 +194,29 @@
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property caosdb-f-form-field-required" data-field-name="cutting_date" data-groups="(part2)(part3)" style="">
-      <label class="control-label col-sm-3" data-property-name="cutting_date" for="cutting_date">Cutting Date</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property caosdb-f-form-field-required" data-field-name="cutting_date" data-groups="(part2)(part3)" style="">
+      <label class="col-form-label col-sm-3" data-property-name="cutting_date" for="cutting_date">Cutting Date</label>
       <div class="caosdb-f-property-value col-sm-9">
         <input class="form-control caosdb-property-text-value" name="cutting_date" type="date"/>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="bag_numbers" data-groups="(part2)(part3)" style="">
-      <label class="control-label col-sm-3" data-property-name="bag_numbers" for="bag_numbers">Bag Numbers</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="bag_numbers" data-groups="(part2)(part3)" style="">
+      <label class="col-form-label col-sm-3" data-property-name="bag_numbers" for="bag_numbers">Bag Numbers</label>
       <div class="caosdb-f-field caosdb-f-entity-property" data-field-name="bag_numbers_from">
-        <label class="control-label col-sm-1" data-property-name="bag_numbers_from" for="bag_numbers_from">from</label>
+        <label class="col-form-label col-sm-1" data-property-name="bag_numbers_from" for="bag_numbers_from">from</label>
         <div class="caosdb-f-property-value col-sm-3">
           <input class="form-control caosdb-property-text-value" name="bag_numbers_from" step="1" type="number"/>
         </div>
       </div>
       <div class="caosdb-f-field caosdb-f-entity-property" data-field-name="bag_numbers_to">
-        <label class="control-label col-sm-1 col-sm-offset-1" data-property-name="bag_numbers_to" for="bag_numbers_to">to</label>
+        <label class="col-form-label col-sm-1 col-sm-offset-1" data-property-name="bag_numbers_to" for="bag_numbers_to">to</label>
         <div class="caosdb-f-property-value col-sm-3">
           <input class="form-control caosdb-property-text-value" name="bag_numbers_to" step="1" type="number"/>
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="box_of_new_samples" data-groups="(part2)(part3)" style="">
-      <label class="control-label col-sm-3" data-property-name="box_of_new_samples" for="box_of_new_samples">Box of New Samples</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="box_of_new_samples" data-groups="(part2)(part3)" style="">
+      <label class="col-form-label col-sm-3" data-property-name="box_of_new_samples" for="box_of_new_samples">Box of New Samples</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select form-control bs3">
           <select class="selectpicker form-control" name="box_of_new_samples" tabindex="-98" title="Nothing selected">
@@ -230,7 +230,7 @@
             <option value="2123">1112</option>
             <option value="4434">6053</option>
           </select>
-          <button aria-expanded="false" class="btn dropdown-toggle btn-default" data-toggle="dropdown" role="button" title="0062" type="button">
+          <button aria-expanded="false" class="btn dropdown-toggle btn-secondary" data-toggle="dropdown" role="button" title="0062" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">0062</div>
@@ -288,8 +288,8 @@
         </div>
       </div>
     </div>
-    <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="new_subsamples_selector" data-groups="(part3)" style="">
-      <label class="control-label col-sm-3" data-property-name="new_subsamples_selector" for="new_subsamples_selector">New Subsamples</label>
+    <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="new_subsamples_selector" data-groups="(part3)" style="">
+      <label class="col-form-label col-sm-3" data-property-name="new_subsamples_selector" for="new_subsamples_selector">New Subsamples</label>
       <div class="col-sm-9">
         <div class="dropdown bootstrap-select show-tick form-control bs3">
           <select class="selectpicker form-control" multiple="multiple" name="new_subsamples_selector" tabindex="-98" title="Nothing selected">
@@ -297,7 +297,7 @@
             <option value="6338">PP_Sample</option>
             <option value="6340">LASM_Sample</option>
           </select>
-          <button aria-expanded="false" class="btn dropdown-toggle btn-default" data-toggle="dropdown" role="button" title="Subsample, PP_Sample" type="button">
+          <button aria-expanded="false" class="btn dropdown-toggle btn-secondary" data-toggle="dropdown" role="button" title="Subsample, PP_Sample" type="button">
             <div class="filter-option">
               <div class="filter-option-inner">
                 <div class="filter-option-inner-inner">Subsample, PP_Sample</div>
@@ -336,25 +336,25 @@
     <div class="col-sm-9 col-sm-offset-3 row" style="background-color: rgb(255, 255, 255);">
       <fieldset class="form-inline caosdb-f-form-elements-subform" data-subform-name="new_subsamples" id="new_subsamples_6335" style="padding-left: 15px; padding-right: 15px;">
         <legend>Subsample</legend>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="type">
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="type">
           <div class="caosdb-f-property-value col-sm-9">
             <input class="form-control caosdb-property-text-value" name="type" type="hidden" value="6335"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="width" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="width" for="width">width (cm)</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="width" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="width" for="width">width (cm)</label>
           <div class="caosdb-f-property-value">
             <input class="form-control caosdb-property-text-value" name="width" step="any" type="number"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="height" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="height" for="height">height (cm)</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="height" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="height" for="height">height (cm)</label>
           <div class="caosdb-f-property-value">
             <input class="form-control caosdb-property-text-value" name="height" step="any" type="number"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="rectangular" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="rectangular" for="rectangular">rectangular</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="rectangular" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="rectangular" for="rectangular">rectangular</label>
           <div class="caosdb-f-property-value">
             <input class="caosdb-property-text-value" name="rectangular" type="checkbox"/>
           </div>
@@ -362,25 +362,25 @@
       </fieldset>
       <fieldset class="form-inline caosdb-f-form-elements-subform" data-subform-name="new_subsamples" id="new_subsamples_6338" style="padding-left: 15px; padding-right: 15px;">
         <legend>PP_Sample</legend>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="type">
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="type">
           <div class="caosdb-f-property-value col-sm-9">
             <input class="form-control caosdb-property-text-value" name="type" type="hidden" value="6338"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="width" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="width" for="width">width (cm)</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="width" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="width" for="width">width (cm)</label>
           <div class="caosdb-f-property-value">
             <input class="form-control caosdb-property-text-value" name="width" step="any" type="number"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="height" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="height" for="height">height (cm)</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="height" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="height" for="height">height (cm)</label>
           <div class="caosdb-f-property-value">
             <input class="form-control caosdb-property-text-value" name="height" step="any" type="number"/>
           </div>
         </div>
-        <div class="form-group caosdb-f-field caosdb-f-entity-property" data-field-name="rectangular" style="margin-left: 15px; margin-right: 15px;">
-          <label class="control-label" data-property-name="rectangular" for="rectangular">rectangular</label>
+        <div class="form-control caosdb-f-field caosdb-f-entity-property" data-field-name="rectangular" style="margin-left: 15px; margin-right: 15px;">
+          <label class="col-form-label" data-property-name="rectangular" for="rectangular">rectangular</label>
           <div class="caosdb-f-property-value">
             <input class="caosdb-property-text-value" name="rectangular" type="checkbox"/>
           </div>
@@ -388,8 +388,8 @@
       </fieldset>
     </div>
     <div class="text-right caosdb-f-form-elements-footer">
-      <button class="caosdb-f-form-elements-submit-button btn btn-primary btn-default" type="submit">Submit</button>
-      <button class="caosdb-f-form-elements-cancel-button btn btn-primary btn-default" type="button">Cancel</button>
+      <button class="caosdb-f-form-elements-submit-button btn btn-primary btn-secondary" type="submit">Submit</button>
+      <button class="caosdb-f-form-elements-cancel-button btn btn-primary btn-secondary" type="button">Cancel</button>
     </div>
   </form>
 </div>
diff --git a/test/core/index.html b/test/core/index.html
index a725205ea767d38c29931a074a7671a2fbd22bc2..0dfea85580fe64d0f7a4676f1d919ec5662dee09 100644
--- a/test/core/index.html
+++ b/test/core/index.html
@@ -22,77 +22,19 @@
  * ** end header
 -->
 <html>
-<head>
-  <meta charset="utf-8"/>
-  <title>WebCaosDB Unit Tests</title>
-  <link rel="stylesheet" href="css/qunit.css"/>
-  <link rel="stylesheet" href="css/webcaosdb.css"/>
-  <link rel="stylesheet" href="css/leaflet.css"/>
-</head>
-<body>
-  <div id="qunit"></div>
-  <div id="qunit-fixture"></div>
-  <script src="js/jquery.js"></script>
-  <script src="js/loglevel.js"></script>
-  <script src="js/bootstrap.js"></script>
-  <script src="js/bootstrap-select.js"></script>
-  <script src="js/bootstrap-autocomplete.min.js"></script>
-  <script src="js/utif.js"></script>
-  <script src="js/pako.js"></script>
-  <script src="js/webcaosdb.js"></script>
-  <script src="js/plotly.js"></script>
-  <script>
-      caosdb_modules.auto_init = false;
-      log.setLevel("trace");
-  </script>
-  <script src="js/caosdb.js"></script>
-  <script src="js/state-machine.js"></script>
-  <script src="js/showdown.js"></script>
-  <script src="js/qunit.js"></script>
-  <script src="js/dropzone.js"></script>
-  <script src="js/setup.js"></script>
-  <script src="js/preview.js"></script>
-  <script src="js/annotation.js"></script>
-  <script src="js/edit_mode.js"></script>
-  <script src="js/query_shortcuts.js"></script>
-  <script src="js/ext_references.js"></script>
-  <script src="js/ext_file_download.js"></script>
-  <script src="js/ext_xls_download.js"></script>
-  <script src="js/form_elements.js"></script>
-  <script src="js/tour.js"></script>
-  <script src="js/leaflet.js"></script>
-  <script src="js/leaflet-graticule.js"></script>
-  <script src="js/leaflet-latlng-graticule.js"></script>
-  <script src="js/leaflet-coordinates.js"></script>
-  <script src="js/proj4.js"></script>
-  <script src="js/proj4leaflet.js"></script>
-  <script src="js/ext_map.js"></script>
-  <script src="js/ext_table_preview.js"></script>
-  <script src="js/ext_bottom_line.js"></script>
-  <script src="js/ext_autocomplete.js"></script>
-  <script src="js/ext_sss_markdown.js"></script>
-  <script src="js/ext_trigger_crawler_form.js"></script>
-  <script src="js/ext_bookmarks.js"></script>
-  <!--EXTENSIONS-->
-  <script src="js/modules/webcaosdb.js.js"></script>
-  <script src="js/modules/caosdb.js.js"></script>
-  <script src="js/modules/common.xsl.js"></script>
-  <script src="js/modules/entity.xsl.js"></script>
-  <script src="js/modules/welcome.xsl.js"></script>
-  <script src="js/modules/query.xsl.js"></script>
-  <script src="js/modules/annotation.xsl.js"></script>
-  <script src="js/modules/navbar.xsl.js"></script>
-  <script src="js/modules/edit_mode.js.js"></script>
-  <script src="js/modules/ext_xls_download.js.js"></script>
-  <script src="js/modules/ext_file_download.js.js"></script>
-  <script src="js/modules/query_shortcuts.js.js"></script>
-  <script src="js/modules/form_elements.js.js"></script>
-  <script src="js/modules/ext_references.js.js"></script>
-  <script src="js/modules/ext_map.js.js"></script>
-  <script src="js/modules/ext_bottom_line.js.js"></script>
-  <script src="js/modules/ext_autocomplete.js.js"></script>
-  <script src="js/modules/ext_sss_markdown.js.js"></script>
-  <script src="js/modules/ext_trigger_crawler_form.js.js"></script>
-  <script src="js/modules/ext_bookmarks.js.js"></script>
-</body>
+  <head>
+    <meta charset="utf-8" />
+    <title>WebCaosDB Unit Tests</title>
+    <link rel="stylesheet" href="css/qunit.css" />
+    <link rel="stylesheet" href="css/webcaosdb.css" />
+    <link rel="stylesheet" href="css/leaflet.css" />
+  </head>
+  <body>
+    <div id="qunit"></div>
+    <div id="qunit-fixture"></div>
+    <script>
+      var _caosdb_modules_auto_init = false;
+    </script>
+    <!--JS_INCLUDE-->
+  </body>
 </html>
diff --git a/test/core/js/modules/annotation.xsl.js b/test/core/js/modules/annotation.xsl.js
index 20815816d5d1de75c4efeb11117f839bacd4ca1d..3640d93c0e1d33c638c92c9e2830c77c0e44ff40 100644
--- a/test/core/js/modules/annotation.xsl.js
+++ b/test/core/js/modules/annotation.xsl.js
@@ -35,7 +35,7 @@ QUnit.module("annotation.xsl", {
 		
 		
 		this.testCases = [];
-		this.testCases[0] = '<Response><Record><Property name="annotationOf"/><History transaction="INSERT" datetime="2015-12-24T20:15:00" username="someuser"/><Property name="comment">This is a comment</Property></Record><Record><Property name="annotationOf"/></Record></Response>';
+		this.testCases[0] = '<Response><Record><Property name="annotationOf"/><Version head="true" date="2015-12-24T20:15:00" username="someuser"/><Property name="comment">This is a comment</Property></Record><Record><Property name="annotationOf"/></Record></Response>';
 		assert.ok(str2xml(this.testCases[0]));
 	}
 });
@@ -63,10 +63,10 @@ QUnit.test("Record rule returns li elements", function(assert){
 
 	var media = annos[0].children[0];
 	assert.equal(media.tagName, "DIV", "is DIV");
-	assert.equal(media.className, "media", "className is media");
+	assert.equal(media.className, "d-flex", "className is d-flex");
 	assert.equal(media.children.length, 2, "media has two children");
-	assert.equal(media.children[0].className, "media-left");
-	assert.equal(media.children[1].className, "media-body");
+	assert.equal(media.children[0].className, "d-shrink-0");
+	assert.equal(media.children[1].className, "flex-grow-1 ms-3");
 	
 });
 
@@ -75,12 +75,12 @@ QUnit.test("History element", function(assert){
 	var xml = str2xml(xml_str);
 	
 	var html = xslt(xml, this.annotationXSL);
-	var mediaBody = html.firstChild.getElementsByClassName("media-body")[0];
+	var mediaBody = html.firstChild.getElementsByClassName("caosdb-f-comment-body")[0];
 	assert.ok(mediaBody, "media-body is there");
 	assert.ok(mediaBody.children.length>0,"media-body has children");
-	var mediaHeading = mediaBody.getElementsByClassName("media-heading")[0];
+
+	var mediaHeading = html.firstChild.getElementsByClassName("caosdb-f-comment-header")[0];
 	assert.ok(mediaHeading, "media-heading is there");
-	assert.equal(mediaHeading.parentNode, mediaBody, "media-heading is child of media-body");
 	
 	assert.ok(xml2str(mediaHeading).indexOf("someuser")!==-1, "username is there");
 	assert.ok(xml2str(mediaHeading).indexOf("2015-12-24T20:15:00")!==-1, "datetime is there");
@@ -92,7 +92,7 @@ QUnit.test("Comment text", function(assert){
 	
 	var html = xslt(xml, this.annotationXSL);
 	
-	var mediaBody = html.firstChild.getElementsByClassName("media-body")[0];
+	var mediaBody = html.firstChild.getElementsByClassName("caosdb-f-comment-body")[0];
 	assert.ok(mediaBody, "media-body is there");
 	assert.ok(mediaBody.children.length>0,"media-body has children");
 	var commentText = mediaBody.getElementsByClassName("caosdb-comment-annotation-text")[0];
diff --git a/test/core/js/modules/edit_mode.js.js b/test/core/js/modules/edit_mode.js.js
index 8fde3bac9ce33742c5d79ca9e5ca03e2d0e0d094..3a87ee73d167d114d0b7db2b0abe50e4a643f8fa 100644
--- a/test/core/js/modules/edit_mode.js.js
+++ b/test/core/js/modules/edit_mode.js.js
@@ -420,10 +420,6 @@ QUnit.test("get_edit_panel", function (assert) {
     assert.ok(edit_mode.get_edit_panel);
 });
 
-QUnit.test("add_wait_datamodel_info", function (assert) {
-    assert.ok(edit_mode.add_wait_datamodel_info);
-});
-
 QUnit.test("toggle_edit_panel", function (assert) {
     assert.ok(edit_mode.toggle_edit_panel);
 });
@@ -485,97 +481,90 @@ QUnit.test("remove_delete_button", function (assert) {
 });
 
 
-{
-
-    const datamodel = `
-<div><div class=\"btn-group-vertical\"><button type=\"button\" class=\"btn btn-default caosdb-f-edit-panel-new-button new-property\">Create new Property</button><button type=\"button\" class=\"btn btn-default caosdb-f-edit-panel-new-button new-recordtype\">Create new RecordType</button></div><div title=\"Drag and drop Properties from this panel to the Entities on the left.\" class=\"panel panel-default\"><div class=\"panel-heading\"><h5>Existing Properties</h5></div><div class=\"panel-body\"><div class=\"input-group\" style=\"width: 100%;\"><input class=\"form-control\" placeholder=\"filter...\" title=\"Type a name (full or partial).\" oninput=\"edit_mode.filter('properties');\" id=\"caosdb-f-filter-properties\" type=\"text\" /><span class=\"input-group-btn\"><button class=\"btn btn-default caosdb-f-edit-panel-new-button new-property caosdb-f-hide-on-empty-input\" title=\"Create this Property.\"><span class=\"glyphicon glyphicon-plus\"></span></button></span></div><ul class=\"caosdb-v-edit-list\"><li class=\"caosdb-f-edit-drag list-group-item caosdb-v-edit-drag\" id=\"caosdb-f-edit-p-20\">name</li><li class=\"caosdb-f-edit-drag list-group-item caosdb-v-edit-drag\" id=\"caosdb-f-edit-p-21\">unit</li><li class=\"caosdb-f-edit-drag list-group-item caosdb-v-edit-drag\" id=\"caosdb-f-edit-p-24\">description</li></ul></div></div><div title=\"Drag and drop RecordTypes from this panel to the Entities on the left.\" class=\"panel panel-default\"><div class=\"panel-heading\"><h5>Existing RecordTypes</h5></div><div class=\"panel-body\"><div class=\"input-group\" style=\"width: 100%;\"><input class=\"form-control\" placeholder=\"filter...\" title=\"Type a name (full or partial).\" oninput=\"edit_mode.filter('recordtypes');\" id=\"caosdb-f-filter-recordtypes\" type=\"text\" /><span class=\"input-group-btn\"><button class=\"btn btn-default caosdb-f-edit-panel-new-button new-recordtype caosdb-f-hide-on-empty-input\" title=\"Create this RecordType\"><span class=\"glyphicon glyphicon-plus\"></span></button></span></div><ul class=\"caosdb-v-edit-list\"><li class=\"caosdb-f-edit-drag list-group-item caosdb-v-edit-drag\" id=\"caosdb-f-edit-rt-30992\">Test</li><li class=\"caosdb-f-edit-drag list-group-item caosdb-v-edit-drag\" id=\"caosdb-f-edit-rt-31015\">Test2</li></ul></div></div></div>`;
-
-    edit_mode.query = async function(q) {
-        return [];
-    }
+edit_mode.query = async function(q) {
+    return [];
+}
 
-    QUnit.test("test case 1 - insert property", async function (assert) {
+QUnit.test("test case 1 - insert property", async function (assert) {
 
-        // here lives the test tool box
-        const test_tool_box = $('<div class="caosdb-f-edit-panel-body" />');
+    // here lives the test tool box
+    const test_tool_box = $('<div class="caosdb-f-edit-panel-body" > <div class="list-group list-group-flush"> <div class="list-group-item btn-group-vertical caosdb-v-editmode-btngroup caosdb-f-edit-mode-create-buttons"> <button type="button" class="btn btn-secondary caosdb-f-edit-panel-new-button new-property">Create Property</button> <button type="button" class="btn btn-secondary caosdb-f-edit-panel-new-button new-recordtype">Create RecordType</button> </div> </div>');
 
-        // here live the entities
-        const main_panel = $('<div class="caosdb-f-main-entities"/>');
-        assert.equal($(".caosdb-f-main-entities").length, 0);
+    // here live the entities
+    const main_panel = $('<div class="caosdb-f-main-entities"/>');
+    assert.equal($(".caosdb-f-main-entities").length, 0);
 
-        $(document.body).append(test_tool_box).append(main_panel);
+    $(document.body).append(test_tool_box).append(main_panel);
 
 
-        // ENTER EDIT MODE
-        assert.equal(edit_mode.is_edit_mode(), false, "edit_mode should not be active");
-        // fake server response
-        edit_mode.retrieve_data_model = async function () {
-            return str2xml(datamodel);
-        }
-        var app = await edit_mode.enter_edit_mode();
-        assert.equal(edit_mode.is_edit_mode(), true, "now, edit_mode should be active");
+    // ENTER EDIT MODE
+    assert.equal(edit_mode.is_edit_mode(), false, "edit_mode should not be active");
+    // fake server response
+    edit_mode.retrieve_data_model = async function () {
+        return str2xml("<Response/>");
+    }
+    var app = await edit_mode.enter_edit_mode();
+    assert.equal(edit_mode.is_edit_mode(), true, "now, edit_mode should be active");
 
 
-        // NEW PROPERTY
-        assert.equal($(".caosdb-f-edit-panel-new-button.new-property").length, 2, "two new-property buttons should be present");
-        assert.equal($(".caosdb-entity-panel").length, 0, "no entities");
-        assert.equal(app.state, "initial", "initial state");
-        // click on "new property"
-        $(".caosdb-f-edit-panel-new-button.new-property").first().click();
+    // NEW PROPERTY
+    assert.equal($(".caosdb-f-edit-panel-new-button.new-property").length, 1, "one new-property button should be present");
+    assert.equal($(".caosdb-entity-panel").length, 0, "no entities");
+    assert.equal(app.state, "initial", "initial state");
+    // click on "new property"
+    $(".caosdb-f-edit-panel-new-button.new-property").first().click();
 
-        while (app.state === "initial") {
-            await sleep(500);
-        }
-
-        // EDIT PROPERTY
-        assert.equal(app.state, "changed", "changed state");
-        var entity = $(".caosdb-entity-panel");
-        assert.equal(entity.length, 1, "entity added");
-        // set name
-        $(".caosdb-entity-panel .caosdb-f-entity-name").val("TestProperty");
-
-        // SAVE
-        var save_button = $(".caosdb-f-entity-save-button");
-        assert.equal(save_button.length, 1, "save button available");
-        // fake server response
-        connection.post = async function (uri, data) {
-            await sleep(500);
-            assert.equal(xml2str(data), "<Request><Property name=\"TestProperty\" datatype=\"TEXT\"/></Request>");
-            assert.equal(app.state, "wait", "in wait state");
-            return str2xml("<Response><Property id=\"newId\" name=\"TestProperty\" datatype=\"TEXT\"/></Response>");
-        }
-        // click save button
-        var updated_entity = main_panel.find(".caosdb-entity-panel .caosdb-id:contains('newId')");
-        assert.equal(updated_entity.length, 0, "entity with id not yet in main panel");
-        save_button.click();
+    while (app.state === "initial") {
+        await sleep(500);
+    }
 
-        while (app.state === "changed" || app.state === "wait") {
-            await sleep(500);
-        }
+    // EDIT PROPERTY
+    assert.equal(app.state, "changed", "changed state");
+    var entity = $(".caosdb-entity-panel");
+    assert.equal(entity.length, 1, "entity added");
+    // set name
+    $(".caosdb-entity-panel .caosdb-f-entity-name").val("TestProperty");
+
+    // SAVE
+    var save_button = $(".caosdb-f-entity-save-button");
+    assert.equal(save_button.length, 1, "save button available");
+    // fake server response
+    connection.post = async function (uri, data) {
+        await sleep(500);
+        assert.equal(xml2str(data), "<Request><Property name=\"TestProperty\" datatype=\"TEXT\"/></Request>");
+        assert.equal(app.state, "wait", "in wait state");
+        return str2xml("<Response><Property id=\"newId\" name=\"TestProperty\" datatype=\"TEXT\"/></Response>");
+    }
+    // click save button
+    var updated_entity = main_panel.find(".caosdb-entity-panel .caosdb-id:contains('newId')");
+    assert.equal(updated_entity.length, 0, "entity with id not yet in main panel");
+    save_button.click();
 
-        // SEE RESPONSE
-        assert.equal(app.state, "initial", "initial state");
+    while (app.state === "changed" || app.state === "wait") {
+        await sleep(500);
+    }
 
-        var response = $("#newId");
-        assert.equal(response.length, 1, "entity added");
+    // SEE RESPONSE
+    assert.equal(app.state, "initial", "initial state");
 
-        // entity has been added to main panel
-        updated_entity = main_panel.find(".caosdb-entity-panel .caosdb-id:contains('newId')");
-        assert.equal(updated_entity.length, 1, "entity with new id now in main panel");
+    var response = $("#newId");
+    assert.equal(response.length, 1, "entity added");
 
-        // tests for closed issue https://gitlab.com/caosdb/caosdb-webui/issues/47
-        assert.equal(main_panel.find(".caosdb-entity-panel .caosdb-entity-actions-panel").length, 1, "general actions panel there");
-        assert.equal(main_panel.find(".caosdb-entity-panel .caosdb-f-edit-mode-entity-actions-panel").length, 1, "edit_mode actions panel there (BUG caosdb-webui#47)");
+    // entity has been added to main panel
+    updated_entity = main_panel.find(".caosdb-entity-panel .caosdb-id:contains('newId')");
+    assert.equal(updated_entity.length, 1, "entity with new id now in main panel");
 
-        main_panel.remove();
-        test_tool_box.remove();
+    // tests for closed issue https://gitlab.com/caosdb/caosdb-webui/issues/47
+    assert.equal(main_panel.find(".caosdb-entity-panel .caosdb-entity-actions-panel").length, 1, "general actions panel there");
+    assert.equal(main_panel.find(".caosdb-entity-panel .caosdb-f-edit-mode-entity-actions-panel").length, 1, "edit_mode actions panel there (BUG caosdb-webui#47)");
 
-        edit_mode.leave_edit_mode();
-        assert.equal(edit_mode.is_edit_mode(), false, "edit_mode should not be active");
+    main_panel.remove();
+    test_tool_box.remove();
 
-    });
+    edit_mode.leave_edit_mode();
+    assert.equal(edit_mode.is_edit_mode(), false, "edit_mode should not be active");
 
-}
+});
 
 
 var transformProperty = async function (xml_str) {
diff --git a/test/core/js/modules/entity.xsl.js b/test/core/js/modules/entity.xsl.js
index 9415a10dc6bdbd51f913e9bfe1ce8f48f187d081..bbc1cac0c7eff6bb06c6826c6efb7054827e82c3 100644
--- a/test/core/js/modules/entity.xsl.js
+++ b/test/core/js/modules/entity.xsl.js
@@ -55,7 +55,7 @@ QUnit.test("Property names are not links anymore", function(assert) {
     var xml_str = '<Property name="pname" id="2345" datatype="TEXT">pvalue</Property>';
     var xml = str2xml(xml_str);
     var html = xslt(xml, xsl);
-    assert.equal(html.firstElementChild.getElementsByClassName("caosdb-property-name")[0].outerHTML, '<strong class=\"caosdb-property-name\">pname</strong>', "link there");
+    assert.equal(html.firstElementChild.getElementsByClassName("caosdb-property-name")[0].outerHTML, '<span class=\"caosdb-property-name\">pname</span>', "link there");
 });
 
 QUnit.test("TestRecordType data type is recognized as a reference", function(assert) {
@@ -154,7 +154,7 @@ QUnit.test("single-value template with reference property.", function(assert) {
         'value': '',
         'reference': 'true',
         'boolean': 'false'
-    })), "<span xmlns=\"http://www.w3.org/1999/xhtml\" class=\"caosdb-f-property-single-raw-value caosdb-property-text-value\"></span>", "empty value produces empty span.");
+    })), "<span xmlns=\"http://www.w3.org/1999/xhtml\" class=\"caosdb-f-property-single-raw-value caosdb-property-text-value caosdb-f-property-text-value caosdb-v-property-text-value\"></span>", "empty value produces empty span.");
     let link = callTemplate(this.entityXSL, 'single-value', {
         'value': '1234',
         'reference': 'true',
diff --git a/test/core/js/modules/ext_applicable.js.js b/test/core/js/modules/ext_applicable.js.js
new file mode 100644
index 0000000000000000000000000000000000000000..596f41c9c9a80e47f4a8ebd8268194af4eba1236
--- /dev/null
+++ b/test/core/js/modules/ext_applicable.js.js
@@ -0,0 +1,30 @@
+/*
+ * ** header v3.0
+ * This file is a part of the CaosDB Project.
+ *
+ * Copyright (C) 2020 IndiScale GmbH <info@indiscale.com>
+ * Copyright (C) 2020 Timm Fitschen <t.fitschen@indiscale.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * ** end header
+ */
+
+'use strict';
+
+QUnit.module("ext_applicable", {});
+
+QUnit.test("availability", function(assert) {
+  assert.equal(ext_applicable.version, "0.1");
+});
diff --git a/test/core/js/modules/ext_map.js.js b/test/core/js/modules/ext_map.js.js
index 5afe434e375b40e3f141141b120ed5497939211f..9b6b01022d8106153d50eaa906a0ce33803a8dc3 100644
--- a/test/core/js/modules/ext_map.js.js
+++ b/test/core/js/modules/ext_map.js.js
@@ -86,13 +86,13 @@ QUnit.test("check dependencies", function (assert) {
 QUnit.test("create_toggle_map_button", function (assert) {
     assert.ok(caosdb_map.create_toggle_map_button, "available");
     var button = caosdb_map.create_toggle_map_button();
-    assert.equal(button.tagName, "BUTTON", "is button");
+    assert.equal(button.tagName, "A", "is A");
     assert.ok($(button).hasClass("caosdb-f-toggle-map-button"), "has caosdb-f-toggle-map-button class");
     assert.equal($(button).text(), "Map", "button says 'Map'");
 
     // set other content:
     button = caosdb_map.create_toggle_map_button("Karte");
-    assert.equal(button.tagName, "BUTTON", "is button");
+    assert.equal(button.tagName, "A", "is A");
     assert.ok($(button).hasClass("caosdb-f-toggle-map-button"), "has caosdb-f-toggle-map-button class");
     assert.equal($(button).text(), "Karte", "button says 'Karte'");
 
@@ -134,23 +134,23 @@ QUnit.test("create_map_view", function (assert) {
 
     var map = caosdb_map.create_map_view(map_panel[0], view_config);
 
-    console.log(map_panel[0]);
     assert.ok(map instanceof L.Map, "map instance created");
-    assert.ok(map_panel.hasClass("leaflet-container"), "map_panel has .leaflet-container child");
+    assert.equal($(map_panel).find(".leaflet-container").length, 1, "map_panel has .leaflet-container child");
 
     assert.notOk(map._crs, "no special crs");
     map.remove();
+    map_panel = $("<div/>");
 
     // test with pre-defined crs
     view_config["crs"] = "Simple";
     map = caosdb_map.create_map_view(map_panel[0], view_config);
 
-    console.log(map_panel[0]);
     assert.ok(map instanceof L.Map, "map instance created");
-    assert.ok(map_panel.hasClass("leaflet-container"), "map_panel has .leaflet-container child");
+    assert.equal($(map_panel).find(".leaflet-container").length, 1, "map_panel has .leaflet-container child");
     assert.equal(map._crs, L.CRS.Simple, "map has SIMPLE crs");
 
     map.remove();
+    map_panel = $("<div/>");
 
     // test with special crs:
     view_config["crs"] = {
@@ -165,7 +165,7 @@ QUnit.test("create_map_view", function (assert) {
 
     console.log(map_panel[0]);
     assert.ok(map instanceof L.Map, "map instance created");
-    assert.ok(map_panel.hasClass("leaflet-container"), "map_panel has .leaflet-container child");
+    assert.equal($(map_panel).find(".leaflet-container").length, 1, "map_panel has .leaflet-container child");
     assert.ok(map._crs instanceof L.Proj.CRS, "map has special crs");
 
     map.remove();
diff --git a/test/core/js/modules/form_elements.js.js b/test/core/js/modules/form_elements.js.js
index aa2e281c7d25f03ce8ed109fb5728919635abec6..f93fde0db2d69156312b2a34c3748112619b68eb 100644
--- a/test/core/js/modules/form_elements.js.js
+++ b/test/core/js/modules/form_elements.js.js
@@ -785,4 +785,4 @@ QUnit.test("make_file_input", function (assert) {
     assert.equal(file_input.find(":input").attr("name"), "some_file", "has file input with correct name");
     assert.ok(file_input.find(":input").prop("multiple"), "is multiple");
     assert.equal(file_input.find(":input").attr("accept"), ".tsv, .csv", "accept there");
-});
\ No newline at end of file
+});
diff --git a/test/core/js/modules/query.xsl.js b/test/core/js/modules/query.xsl.js
index 5c37ad4e39971130912a9169ab64189d20e5a591..371b51598918e2fd6bb5d94ca13a94337ccd322e 100644
--- a/test/core/js/modules/query.xsl.js
+++ b/test/core/js/modules/query.xsl.js
@@ -52,7 +52,7 @@ QUnit.test("basic properties of select-table feature", function(assert) {
     var xml = str2xml("<Selection/>");
     var html = xslt(xml, xsl);
     assert.equal(html.firstElementChild.tagName, "DIV", "first child is div.");
-    assert.equal(html.firstElementChild.className, "panel panel-default caosdb-select-table", "first child has class caosdb-select-table.");
+    assert.equal(html.firstElementChild.className, "card caosdb-select-table", "first child has class caosdb-select-table.");
 });
 
 /* Test table of empty result sets of queries */
@@ -122,7 +122,7 @@ QUnit.test("Query tag is transformed via xslt", function(assert) {
     let html = applyTemplates(str2xml('<Query/>'), this.queryXSL, 'query-results');
     //var html = xslt(xml, xsl);
     assert.equal(html.firstElementChild.tagName, "DIV", "first child is div.");
-    assert.equal(html.firstElementChild.className, "panel panel-default caosdb-query-response", "first child has class caosdb-query-reponse.");
+    assert.equal(html.firstElementChild.className, "card caosdb-query-response mb-2", "first child has class caosdb-query-reponse.");
 });
 
 QUnit.test("xsl defines id 'caosdb-query-form'", function(assert) {
@@ -141,14 +141,12 @@ QUnit.test("xsl script's 'caosdb-query-form' has a hidden input, with name=P and
 });
 
 
-QUnit.test("Query is available, contained by a div.", function(assert) {
-    var cont = getQueryFormContainer(this.queryXSL);
-    assert.equal(cont.tagName, "DIV", "contained by a div");
-    assert.equal(cont.className, "container caosdb-query-panel", "container has classname 'container caosdb-query-panel'");
-    assert.equal(cont.firstElementChild.tagName, "FORM", "form element is available");
-    assert.equal(cont.firstElementChild.className, "panel", "FORM has class 'panel'");
-    assert.equal(cont.firstElementChild.id, "caosdb-query-form", "FORM has id 'caosdb-query-form'");
+QUnit.test("Query is available", function(assert) {
+    var cont = getQueryForm(this.queryXSL);
+    assert.equal(cont.tagName, "FORM", "contained by a div");
+    assert.equal(cont.className, "card caosdb-query-form", "container has classname 'card caosdb-query-form'");
 });
+
 QUnit.test("Query is send with a paging of 0L10 by default", function(assert) {
     var form_e = getQueryForm(this.queryXSL);
 
@@ -187,11 +185,6 @@ QUnit.test("template select-table-row ", function(assert){
 
 /* MISC FUNCTIONS */
 function getQueryForm(queryXSL) {
-    var cont = getQueryFormContainer(queryXSL);
-    return cont.getElementsByTagName("form")[0];
-}
-
-function getQueryFormContainer(queryXSL) {
     var html = callTemplate(queryXSL, "caosdb-query-panel", {});
     return html.firstElementChild;
 }
diff --git a/test/core/js/modules/webcaosdb.js.js b/test/core/js/modules/webcaosdb.js.js
index aca6c61067d931a41bd56b731cd1998b4d71835d..52bf4ada52d2ce59b59d8615c89ca5796343622b 100644
--- a/test/core/js/modules/webcaosdb.js.js
+++ b/test/core/js/modules/webcaosdb.js.js
@@ -346,7 +346,7 @@ QUnit.test("createUpdateForm", function (assert) {
 QUnit.test("createUpdateEntityHeading", function (assert) {
     let cueh = transaction.update.createUpdateEntityHeading;
     assert.ok(cueh, "function available");
-    let eh = $('<div class="panel-heading"><div class="1strow"></div><div class="2ndrow"></div></div>')[0];
+    let eh = $('<div class="card-header"><div class="1strow"></div><div class="2ndrow"></div></div>')[0];
     assert.equal($(eh).children('.1strow').length, 1, "eh has 1st row");
     assert.equal($(eh).children('.2ndrow').length, 1, "eh has 2nd row");
     let uh = cueh(eh);
@@ -358,7 +358,7 @@ QUnit.test("createUpdateEntityPanel", function (assert) {
     let cued = transaction.update.createUpdateEntityPanel;
     assert.ok(cued, "function available");
     let div = $(cued($('<div id="headingid">heading</div>')));
-    assert.ok(div.hasClass("panel"), "panel has class panel.");
+    assert.ok(div.hasClass("card"), "card has class card.");
     assert.equal(div.children(":first-child")[0].id, "headingid", "heading is first child element");
 });
 
@@ -366,7 +366,7 @@ QUnit.test("updateSingleEntity - success", function (assert) {
     let done = assert.async();
     let use = transaction.update.updateSingleEntity;
     assert.ok(use, "function available");
-    let entityPanel = $('<div class="panel panel-default caosdb-entity-panel"><div class="panel-heading caosdb-entity-panel-heading"><div>heading<div class="caosdb-id">1234</div></div><div>other stuff in the heading</div></div>body</div>')[0];
+    let entityPanel = $('<div class="card caosdb-entity-panel"><div class="card-header caosdb-entity-panel-heading"><div>heading<div class="caosdb-id">1234</div></div><div>other stuff in the heading</div></div>body</div>')[0];
     connection.get = function (uri) {
         assert.equal(uri, 'Entity/1234', 'get was called with correct uri');
         return new Promise((ok, fail) => {
@@ -412,7 +412,7 @@ QUnit.test("updateSingleEntity - success", function (assert) {
 QUnit.test("updateSingleEntity - with errors in the server's response", function (assert) {
     let done = assert.async();
     let use = transaction.update.updateSingleEntity;
-    let entityPanel = $('<div class="panel panel-default caosdb-entity-panel"><div class="panel-heading caosdb-entity-panel-heading"><div>heading<div class="caosdb-id">1234</div></div><div>other stuff in the heading</div></div>body</div>')[0];
+    let entityPanel = $('<div class="card caosdb-entity-panel"><div class="card-header caosdb-entity-panel-heading"><div>heading<div class="caosdb-id">1234</div></div><div>other stuff in the heading</div></div>body</div>')[0];
     connection.get = function (uri) {
         return new Promise((ok, fail) => {
             setTimeout(() => {
@@ -437,10 +437,10 @@ QUnit.test("updateSingleEntity - with errors in the server's response", function
 
     app.onLeaveWaitPutEntity = function (e) {
         assert.equal(e.transition, "openForm", "app returns to form again due to errors.");
-        assert.equal($(app.updatePanel).find('.panel-heading .' + preview.classNameErrorNotification).length, 0, "has no error notification before the response is processed.");
+        assert.equal($(app.updatePanel).find('.card-header .' + preview.classNameErrorNotification).length, 0, "has no error notification before the response is processed.");
 
         setTimeout(() => {
-            assert.equal($(app.updatePanel).find('.panel-heading .' + preview.classNameErrorNotification).length, 1, "has an error notification after the response is processed.");
+            assert.equal($(app.updatePanel).find('.card-header .' + preview.classNameErrorNotification).length, 1, "has an error notification after the response is processed.");
             $(app.updatePanel).remove();
             entityPanel.remove();
             done();
@@ -582,9 +582,6 @@ QUnit.test("addShowPreviewButton", function (assert) {
     assert.throws(() => {
         preview.addShowPreviewButton(null, $('<div/>')[0]);
     }, "null ref_property_elem parameter throws.");
-    assert.throws(() => {
-        preview.addShowPreviewButton(notOkTestElem, $('<div/>')[0]);
-    }, "ref_property_elem w/o caosdb-value-list throws.");
     assert.equal(okTestElem.firstChild.childNodes.length, 0, "before: test div has no children");
     assert.equal(okTestElem, preview.addShowPreviewButton(okTestElem, preview.createShowPreviewButton()), "returns the first parameter");
     assert.equal(okTestElem.firstChild.childNodes.length, 1, "after: test div has new child");
@@ -774,25 +771,25 @@ QUnit.test("removeAllWaitingNotifications", function (assert) {
 QUnit.test("getActiveSlideItemIndex", function (assert) {
     assert.ok(preview.getActiveSlideItemIndex, "function available");
     let okElem0 = $('<div><div class="carousel-inner">' +
-        '<div class="item active"></div>' // index 0
+        '<div class="carousel-item active"></div>' // index 0
         +
-        '<div class="item"></div>' +
-        '<div class="item"></div>' +
+        '<div class="carousel-item"></div>' +
+        '<div class="carousel-item"></div>' +
         '</div></div>')[0];
     let okElem1 = $('<div><div class="carousel-inner">' +
-        '<div class="item"></div>' +
-        '<div class="item active"></div>' // index 1
+        '<div class="carousel-item"></div>' +
+        '<div class="carousel-item active"></div>' // index 1
         +
-        '<div class="item"></div>' +
+        '<div class="carousel-item"></div>' +
         '</div></div>')[0];
     let okElem2 = $('<div><div class="carousel-inner">' +
-        '<div class="item"></div>' +
-        '<div class="item"></div>' +
-        '<div class="item active"></div>' // index 2
+        '<div class="carousel-item"></div>' +
+        '<div class="carousel-item"></div>' +
+        '<div class="carousel-item active"></div>' // index 2
         +
         '</div></div>')[0];
     let noInner = $('<div></div>')[0];
-    let noActive = $('<div><div class="carousel-inner"><div class="item"></div></div></div>')[0];
+    let noActive = $('<div><div class="carousel-inner"><div class="carousel-item"></div></div></div>')[0];
 
     assert.throws(() => {
         preview.getActiveSlideItemIndex()
@@ -855,14 +852,14 @@ QUnit.test("createEmptyInner", function (assert) {
 
     let inner = preview.createEmptyInner(3);
     assert.equal(inner.children.length, 3, "three items");
-    assert.equal(inner.children[0].className, "item active", "first item is active");
-    assert.equal(inner.children[1].className, "item", "second item is not active");
-    assert.equal(inner.children[2].className, "item", "third item is not active");
+    assert.equal(inner.children[0].className, "carousel-item active", "first item is active");
+    assert.equal(inner.children[1].className, "carousel-item", "second item is not active");
+    assert.equal(inner.children[2].className, "carousel-item", "third item is not active");
 });
 
 QUnit.test("createCarouselNav", function (assert) {
     assert.ok(preview.createCarouselNav, "function available");
-    let refLinks = $('<div style="display: none;" class="caosdb-value-list"><a><span class="caosdb-id">1234</span></a><a><span class="caosdb-id">2345</span></a><a><span class="caosdb-id">3456</span></a><a><span class="caosdb-id">4567</span></a></div>')[0];
+    let refLinks = $('<div style="display: none;" class="caosdb-value-list"><a class="caosdb-f-reference-value"><span class="caosdb-id">1234</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">2345</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">3456</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">4567</span></a></div>')[0];
     assert.throws(() => {
         preview.createCarouselNav();
     }, "no param throws");
@@ -875,16 +872,16 @@ QUnit.test("createCarouselNav", function (assert) {
 
     let nav = preview.createCarouselNav(refLinks, "cid");
     assert.equal(nav.className, "caosdb-preview-carousel-nav", "caosdb-carousel-nav");
-    assert.ok($(nav).find('[data-slide="prev"][href="#cid"]')[0], "has prev button");
-    assert.ok($(nav).find('[data-slide="next"][href="#cid"]')[0], "has next button");
+    assert.ok($(nav).find('[data-bs-slide="prev"][href="#cid"]')[0], "has prev button");
+    assert.ok($(nav).find('[data-bs-slide="next"][href="#cid"]')[0], "has next button");
     let selectors = preview.getRefLinksContainer(nav);
     assert.equal(selectors.children.length, 4, '4 selctor buttons');
     $(document.body).append(nav);
     assert.equal($(selectors).is(':hidden'), false, "selectors not hidden.");
     $(nav).remove();
     $(selectors).find('a').each((index, button) => {
-        assert.equal(button.getAttribute("data-slide-to"), index, "buttons have correct data-slide-to attribute");
-        assert.equal(button.getAttribute("data-target"), "#cid", "buttons have correct data-target attribute");
+        assert.equal(button.getAttribute("data-bs-slide-to"), index, "buttons have correct data-bs-slide-to attribute");
+        assert.equal(button.getAttribute("data-bs-target"), "#cid", "buttons have correct data-bs-target attribute");
         assert.notOk(button.getAttribute("href"), "button dont have href");
     });
     assert.equal($(selectors).find('a:first').hasClass('active'), true, "first button is active");
@@ -892,11 +889,11 @@ QUnit.test("createCarouselNav", function (assert) {
 });
 
 {
-    let refLinks = $('<div class="caosdb-value-list"><a><span class="caosdb-id">1234</span></a><a><span class="caosdb-id">2345</span></a><a><span class="caosdb-id">3456</span></a><a><span class="caosdb-id">4567</span></a></div>')[0];
-    let e1 = $('<div><div class="caosdb-id">1234</div></div>')[0];
-    let e2 = $('<div><div class="caosdb-id">2345</div></div>')[0];
-    let e3 = $('<div><div class="caosdb-id">3456</div></div>')[0];
-    let e4 = $('<div><div class="caosdb-id">4567</div></div>')[0];
+    let refLinks = $('<div class="caosdb-value-list"><a class="caosdb-f-reference-value"><span class="caosdb-id">1234</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">2345</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">3456</span></a><a class="caosdb-f-reference-value"><span class="caosdb-id">4567</span></a></div>')[0];
+    let e1 = $('<a class="caosdb-f-reference-value"><div class="caosdb-id">1234</div></a>')[0];
+    let e2 = $('<a class="caosdb-f-reference-value"><div class="caosdb-id">2345</div></a>')[0];
+    let e3 = $('<a class="caosdb-f-reference-value"><div class="caosdb-id">3456</div></a>')[0];
+    let e4 = $('<a class="caosdb-f-reference-value"><div class="caosdb-id">4567</div></a>')[0];
     let entities = [e1, e3, e4, e2];
     let carousel = preview.createPreviewCarousel(entities, refLinks);
     let correct_order_id = ["1234", "2345", "3456", "4567"];
@@ -923,16 +920,16 @@ QUnit.test("createCarouselNav", function (assert) {
         assert.equal($(carousel).find("." + preview.classNamePreviewCarouselNav).length, 1, "carousel has nav");
         assert.equal($(carousel).find(".carousel-inner").length, 1, "carousel has inner");
         for (let i = 0; i < correct_order_id.length; i++) {
-            assert.equal(getEntityId($(carousel).find('.item')[i]), correct_order_id[i], "entities ids are in order")
+            assert.equal(getEntityId($(carousel).find('.carousel-item')[i]), correct_order_id[i], "entities ids are in order")
         }
 
         assert.ok(carousel.id, "has id");
-        assert.equal($(carousel).attr("data-interval"), "false", "no auto-sliding");
+        assert.equal($(carousel).attr("data-bs-interval"), "false", "no auto-sliding");
     });
 
     QUnit.test("getSelectorButtons", function (assert) {
         assert.ok(preview.getSelectorButtons, "function available");
-        assert.equal(preview.getSelectorButtons($(carousel).find('.' + preview.classNamePreviewCarouselNav)[0])[0].getAttribute('data-slide-to'), "0", "found selector button");
+        assert.equal(preview.getSelectorButtons($(carousel).find('.' + preview.classNamePreviewCarouselNav)[0])[0].getAttribute('data-bs-slide-to'), "0", "found selector button");
     });
 
     QUnit.test("setActiveSlideItemSelector", function (assert) {
@@ -960,8 +957,8 @@ QUnit.test("createCarouselNav", function (assert) {
         assert.equal(preview.setActiveSlideItemSelector(carousel, 1), carousel, "returns carousel");
         for (let i = 0; i < correct_order_id.length; i++) {
             preview.setActiveSlideItemSelector(carousel, i);
-            assert.equal($($(carousel).find('[data-slide-to]')[i]).hasClass("active"), true, "button " + i + " is active");
-            assert.equal($(carousel).find('.item.active').length, 1, "and none else");
+            assert.equal($($(carousel).find('[data-bs-slide-to]')[i]).hasClass("active"), true, "button " + i + " is active");
+            assert.equal($(carousel).find('.carousel-item.active').length, 1, "and none else");
         }
     });
 
@@ -970,11 +967,11 @@ QUnit.test("createCarouselNav", function (assert) {
 
         preview.setActiveSlideItemSelector(carousel, 1);
         assert.equal(preview.getActiveSlideItemIndex(carousel), 0, "before: active item is 0");
-        assert.equal($(carousel).find('.' + preview.classNamePreviewCarouselNav).find('.active')[0].getAttribute('data-slide-to'), 1, 'before: active selector is 1.');
+        assert.equal($(carousel).find('.' + preview.classNamePreviewCarouselNav).find('.active')[0].getAttribute('data-bs-slide-to'), 1, 'before: active selector is 1.');
         $(carousel).on('slid.bs.carousel', preview.triggerUpdateActiveSlideItemSelector);
         $(carousel).trigger('slid.bs.carousel');
         assert.equal(preview.getActiveSlideItemIndex(carousel), 0, "after: active item is 0");
-        assert.equal($(carousel).find('.' + preview.classNamePreviewCarouselNav).find('.active')[0].getAttribute('data-slide-to'), 0, 'after: active selector is 0.');
+        assert.equal($(carousel).find('.' + preview.classNamePreviewCarouselNav).find('.active')[0].getAttribute('data-bs-slide-to'), 0, 'after: active selector is 0.');
     });
 
     QUnit.test("createPreview", function (assert) {
@@ -1056,21 +1053,21 @@ QUnit.test("createCarouselNav", function (assert) {
 
 QUnit.test("preparePreviewEntity", function (assert) {
     assert.ok(preview.preparePreviewEntity, "function available");
-    let e = $('<div><div class="label caosdb-id">1234</div></div>')[0];
+    let e = $('<div><div class="caosdb-v-entity-header-buttons-list"><div class="caosdb-f-reference-value"><a class="caosdb-id">1234</a></div></div></div>')[0];
     let prepared = preview.preparePreviewEntity(e);
-    assert.equal($(prepared).find('a.caosdb-id')[0].href, connection.getBasePath() + "Entity/1234", "link is correct.");
+    assert.equal($(prepared).find("a[title='Load this entity in a new window.']")[0].href, connection.getBasePath() + "Entity/1234", "link is correct.");
 });
 
 QUnit.test("getEntityRef", function (assert) {
     assert.ok(preview.getEntityRef, 'function available');
 
-    var html = $('<div><div class="caosdb-id">sdfg</div></div>')[0];
+    var html = $('<div class="caosdb-f-reference-value"><div class="caosdb-id">sdfg</div></div>')[0];
     assert.equal(preview.getEntityRef(html), "sdfg", "id extracted");
 
-    html = $('<div><div class="caosdb-id"></div></div>')[0];
+    html = $('<div class="caosdb-f-reference-value"><div class="caosdb-id"></div></div>')[0];
     assert.equal(preview.getEntityRef(html), "", "empty string extracted");
 
-    html = $('<div></div>')[0];
+    html = $('<div class="caosdb-f-reference-value"></div>')[0];
     assert.throws(() => {
         preview.getEntityRef(html);
     }, "missing .caosdb-id throws");
@@ -1264,133 +1261,6 @@ QUnit.test("initPaging", function (assert) {
     assert.equal(initPaging(getPageHref(window.location.href, "0L10"), 1234), true, "1234 returns true.");
     assert.equal(initPaging(getPageHref(window.location.href, "0L10"), '1234'), true, "'1234' returns true.");
 
-    // test effectiveness
-    let $pagingPanel = $('<div>', {
-        "class": "caosdb-paging-panel"
-    });
-    let $prevButton = $('<a>', {
-        "class": "caosdb-prev-button"
-    });
-    let $nextButton = $('<a>', {
-        "class": "caosdb-next-button"
-    });
-
-    $pagingPanel.append($prevButton).append($nextButton);
-    $(document.body).append($pagingPanel);
-
-    $prevButton.hide();
-    $nextButton.hide();
-    $pagingPanel.hide();
-
-
-    // no paging at all:
-    let hidden_prev = $('.caosdb-prev-button').css("display") == "none";
-    let hidden_next = $('.caosdb-next-button').css("display") == "none";
-    let hidden_panel = $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(window.location.href);
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(window.location.href, null);
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(null, null);
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(window.location.href, "100");
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(window.location.href, 100);
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    initPaging(getPageHref(window.location.href, "0L100"), "100");
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    hidden_panel = hidden_panel && $('.caosdb-paging-panel').css("display") == "none";
-
-    assert.equal(hidden_prev, true, "prev button has display=none");
-    assert.equal(hidden_next, true, "next button has display=none");
-    assert.equal(hidden_panel, true, "paging panel has display=none");
-
-    // show next button
-    initPaging(getPageHref(window.location.href, "0L10"), 100);
-    hidden_prev = $('.caosdb-prev-button').css("display") == "none";
-    hidden_panel = $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = $('.caosdb-next-button').css("display") != "inline";
-    let nextHrefOk = $('.caosdb-next-button').attr('href') == getPageHref(window.location.href, "10L10");
-
-    initPaging(getPageHref(window.location.href, "0L10"), "100");
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_panel = hidden_panel || $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = hidden_next || $('.caosdb-next-button').css("display") != "inline";
-    nextHrefOk = nextHrefOk && $('.caosdb-next-button').attr('href') == getPageHref(window.location.href, "10L10");
-
-    initPaging(getPageHref(window.location.href, "0L99"), "100");
-    hidden_prev = hidden_prev && $('.caosdb-prev-button').css("display") == "none";
-    hidden_panel = hidden_panel || $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = hidden_next || $('.caosdb-next-button').css("display") != "inline";
-    nextHrefOk = nextHrefOk && $('.caosdb-next-button').attr('href') == getPageHref(window.location.href, "99L99");
-
-    assert.equal(hidden_prev, true, "prev button has display=none");
-    assert.equal(hidden_next, false, "next button has display=inline");
-    assert.equal(hidden_panel, false, "paging panel has display=block");
-    assert.equal(nextHrefOk, true, "next buttons href is ok");
-
-    // show prev button
-    initPaging(getPageHref(window.location.href, "10L100"), 100);
-    hidden_prev = $('.caosdb-prev-button').css("display") != "inline";
-    hidden_panel = $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = $('.caosdb-next-button').css("display") == "none";
-    let prevHrefOk = $('.caosdb-prev-button').attr('href') == getPageHref(window.location.href, "0L100");
-
-    initPaging(getPageHref(window.location.href, "1L100"), 100);
-    hidden_prev = hidden_prev || $('.caosdb-prev-button').css("display") != "inline";
-    hidden_panel = hidden_panel || $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = hidden_next && $('.caosdb-next-button').css("display") == "none";
-    prevHrefOk = prevHrefOk && $('.caosdb-prev-button').attr('href') == getPageHref(window.location.href, "0L100");
-
-    initPaging(getPageHref(window.location.href, "20L10"), 100);
-    hidden_prev = hidden_prev || $('.caosdb-prev-button').css("display") != "inline";
-    hidden_panel = hidden_panel || $('.caosdb-paging-panel').css("display") != "block";
-    prevHrefOk = prevHrefOk && $('.caosdb-prev-button').attr('href') == getPageHref(window.location.href, "10L10");
-
-    assert.equal(hidden_prev, false, "prev button has display=inline");
-    assert.equal(hidden_next, true, "next button has display=none");
-    assert.equal(hidden_panel, false, "paging panel has display=block");
-    assert.equal(prevHrefOk, true, "prev buttons href is ok");
-
-    // show both
-    initPaging(getPageHref(window.location.href, "10L10"), 100);
-    hidden_prev = $('.caosdb-prev-button').css("display") != "inline";
-    hidden_panel = $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = $('.caosdb-next-button').css("display") != "inline";
-    nextHrefOk = nextHrefOk && $('.caosdb-next-button').attr('href') == getPageHref(window.location.href, "20L10");
-    prevHrefOk = prevHrefOk && $('.caosdb-prev-button').attr('href') == getPageHref(window.location.href, "0L10");
-
-    initPaging(getPageHref(window.location.href, "1L100"), 200);
-    hidden_prev = hidden_prev || $('.caosdb-prev-button').css("display") != "inline";
-    hidden_panel = hidden_panel || $('.caosdb-paging-panel').css("display") != "block";
-    hidden_next = hidden_next || $('.caosdb-next-button').css("display") != "inline";
-    nextHrefOk = nextHrefOk && $('.caosdb-next-button').attr('href') == getPageHref(window.location.href, "101L100");
-    prevHrefOk = prevHrefOk && $('.caosdb-prev-button').attr('href') == getPageHref(window.location.href, "0L100");
-
-    assert.equal(hidden_prev, false, "prev button has display=inline");
-    assert.equal(hidden_next, false, "next button has display=inline");
-    assert.equal(hidden_panel, false, "paging panel has display=block");
-    assert.equal(prevHrefOk, true, "prev buttons href is ok");
-    assert.equal(nextHrefOk, true, "next buttons href is ok");
-
-    document.body.removeChild($pagingPanel[0]);
 });
 
 
@@ -1556,8 +1426,8 @@ QUnit.test("convertNewCommentResponse", function (assert) {
     let convertNewAnnotationResponse = annotation.convertNewCommentResponse;
     assert.ok(convertNewAnnotationResponse, "function exists.");
     let done = assert.async();
-    let testResponse = '<Response><Record><Property name="annotationOf"/><History transaction="INSERT" datetime="2015-12-24T20:15:00" username="someuser"/><Property name="comment">This is a comment</Property></Record></Response>';
-    let expectedResult = "<li xmlns=\"http://www.w3.org/1999/xhtml\" class=\"list-group-item markdowned\"><div class=\"media\"><div class=\"media-left\"><h3>»</h3></div><div class=\"media-body\"><h4 class=\"media-heading\">someuser<small><i> posted on 2015-12-24T20:15:00</i></small></h4><p class=\"caosdb-comment-annotation-text\"><p>This is a comment</p></p></div></div></li>";
+    let testResponse = '<Response><Record><Property name="annotationOf"/><Version head="true" date="2015-12-24T20:15:00" username="someuser"/><Property name="comment">This is a comment</Property></Record></Response>';
+    let expectedResult = "<li xmlns=\"http://www.w3.org/1999/xhtml\" class=\"list-group-item markdowned\"><div class=\"d-flex\"><div class=\"d-shrink-0\">»</div><div class=\"flex-grow-1 ms-3\"><div class=\"caosdb-f-comment-header\">someuser<small><i> posted on 2015-12-24T20:15:00</i></small></div><div class=\"caosdb-f-comment-body\"><small><p class=\"caosdb-comment-annotation-text\"><p>This is a comment</p></p></small></div></div></div></li>";
     convertNewAnnotationResponse(str2xml(testResponse), annotation.loadAnnotationXsl("../../")).then(function (result) {
         assert.equal(result.length, 1, "one element returned.");
         assert.equal(xml2str(result[0]).replace(/\n/g, ""), expectedResult, "result converted correctly");
@@ -1674,7 +1544,7 @@ QUnit.test("convertNewCommentResponse error", function (assert) {
         </Response>';
 
     let done = assert.async();
-    let expectedResult = "<divxmlns=\"http://www.w3.org/1999/xhtml\"class=\"alertalert-dangercaosdb-new-comment-erroralert-dismissablemarkdowned\"><buttonclass=\"close\"data-dismiss=\"alert\"aria-label=\"close\">×</button><strong>Error!</strong>Thiscommenthasnotbeeninserted.<pclass=\"small\"><pre><code>&lt;record&gt;&lt;errorcode=\"114\"description=\"Entityhasunqualifiedproperties.\"&gt;&lt;/error&gt;&lt;warningcode=\"0\"description=\"Entityhasnoname.\"&gt;&lt;/warning&gt;&lt;parentname=\"CommentAnnotation\"&gt;&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;/parent&gt;&lt;propertyname=\"comment\"importance=\"FIX\"&gt;sdfasdfasdf&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;errorcode=\"110\"description=\"Propertyhasnodatatype.\"&gt;&lt;/error&gt;&lt;/property&gt;&lt;propertyname=\"annotationOf\"importance=\"FIX\"&gt;20&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;errorcode=\"110\"description=\"Propertyhasnodatatype.\"&gt;&lt;/error&gt;&lt;/property&gt;&lt;/record&gt;</code></pre></p></div>";
+    let expectedResult = "<divxmlns=\"http://www.w3.org/1999/xhtml\"class=\"alertalert-dangercaosdb-new-comment-erroralert-dismissablemarkdowned\"><buttonclass=\"btn-close\"data-bs-dismiss=\"alert\"aria-label=\"close\">×</button><strong>Error!</strong>Thiscommenthasnotbeeninserted.<pclass=\"small\"><pre><code>&lt;record&gt;&lt;errorcode=\"114\"description=\"Entityhasunqualifiedproperties.\"&gt;&lt;/error&gt;&lt;warningcode=\"0\"description=\"Entityhasnoname.\"&gt;&lt;/warning&gt;&lt;parentname=\"CommentAnnotation\"&gt;&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;/parent&gt;&lt;propertyname=\"comment\"importance=\"FIX\"&gt;sdfasdfasdf&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;errorcode=\"110\"description=\"Propertyhasnodatatype.\"&gt;&lt;/error&gt;&lt;/property&gt;&lt;propertyname=\"annotationOf\"importance=\"FIX\"&gt;20&lt;errorcode=\"101\"description=\"Entitydoesnotexist.\"&gt;&lt;/error&gt;&lt;errorcode=\"110\"description=\"Propertyhasnodatatype.\"&gt;&lt;/error&gt;&lt;/property&gt;&lt;/record&gt;</code></pre></p></div>";
     annotation.convertNewCommentResponse(str2xml(errorStr), annotation.loadAnnotationXsl("../../")).then(function (result) {
         assert.equal(xml2str(result[0]).replace(/[\t\n\ ]/g, ""), expectedResult.replace(/[\t\n\ ]/g, ""), "transformed into an error div.");
         done();
@@ -1939,9 +1809,6 @@ QUnit.test("add_button wrong parameters", function (assert) {
 
 QUnit.test("test button classes", function (assert) {
     var result = $(navbar.add_button("TestButton")).children().first()
-    assert.ok(result.hasClass("navbar-btn"), "has class navbar-btn");
-    assert.ok(result.hasClass("btn"), "has class btn");
-    assert.ok(result.hasClass("btn-link"), "has class btn-link");
     assert.equal(result.text(), "TestButton", "text is correct");
 });
 
@@ -2105,4 +1972,4 @@ QUnit.test("submit new password", async function (assert) {
     form[0]["password2"].value = "newtestpassword1A!";
 
     form.find(":submit").click();
-});
\ No newline at end of file
+});
diff --git a/test/core/js/modules/welcome.xsl.js b/test/core/js/modules/welcome.xsl.js
index 39fb9fd0edd9e4950e9bbad3189b2aeed4ed7a7c..de59eedca9bbacdbc4c797f9bfd51d11bb332132 100644
--- a/test/core/js/modules/welcome.xsl.js
+++ b/test/core/js/modules/welcome.xsl.js
@@ -46,10 +46,10 @@ QUnit.test("availability", function(assert) {
 	assert.ok(this.welcomeXSL);
 })
 
-QUnit.test("welcome template produces .caosdb-f-welcome-panel", function(assert) {
+QUnit.test("welcome template produces .caosdb-v-welcome-panel", function(assert) {
     var xsl = injectTemplate(this.welcomeXSL, '<xsl:template match="/"><xsl:call-template name="welcome"/></xsl:template>');
     var xml_str = '<root>';
     var xml = str2xml(xml_str);
     var html = xslt(xml, xsl);
-    assert.ok($(html.firstElementChild).hasClass("caosdb-f-welcome-panel"), "has class .caosdb-f-welcome-panel");
+    assert.ok($(html.firstElementChild).hasClass("caosdb-v-welcome-panel"), "has class .caosdb-v-welcome-panel");
 });
diff --git a/test/docker/Dockerfile b/test/docker/Dockerfile
index 92889dc526229475463ddcdfe6a2080a669b9d25..f90db2f9b2b869e12f52de595b7a7677f52374b5 100644
--- a/test/docker/Dockerfile
+++ b/test/docker/Dockerfile
@@ -13,8 +13,8 @@ RUN  apt-get update \
     && apt-get install -f
 
 RUN pip3 install pylint pytest
-RUN pip3 install caosdb==0.5.1
-RUN pip3 install pandas xlrd==1.2.0
+RUN pip3 install caosdb>=0.5.2
+RUN pip3 install pandas
 RUN pip3 install git+https://gitlab.com/caosdb/caosdb-advanced-user-tools.git@dev
 # For automatic documentation
 #RUN npm install -g jsdoc