ENH: added implementation of role keyword

src/caosadvancedtools/models/parser.py

@@ -264,6 +264,19 @@ class Parser(object):
             # and create the new property
             self.model[name] = db.Property(name=name,
                                            datatype=definition["datatype"])
+        elif (self.model[name] is None and isinstance(definition, dict)
+              and "role" in definition):
+            if definition["role"] == "RecordType":
+                self.model[name] = db.RecordType(name=name)
+            elif definition["role"] == "Record":
+                self.model[name] = db.Record(name=name)
+            elif definition["role"] == "File":
+                self.model[name] = db.File(name=name)
+            elif definition["role"] == "Property":
+                self.model[name] = db.Property(name=name)
+            else:
+                raise RuntimeError("Unknown role {} in definition of entity.".format(
+                    definition["role"]))
 
         # add other definitions recursively