Merge branch 'dev' into f-acm

proto/caosdb/entity/v1/main.proto

@@ -77,7 +77,7 @@ message CollectionValues {
   repeated ScalarValue values = 1;
 }
 
-// Represents special values which are otherwise hard to tranfer via protobuf.
+// Represents special values which are otherwise hard to transfer via protobuf.
 enum SpecialValue {
   // Represent the NULL value.
   SPECIAL_VALUE_UNSPECIFIED = 0;
@@ -95,7 +95,7 @@ message ScalarValue {
     double double_value = 2;
     // The value as bool
     bool boolean_value = 3;
-    // The value as string
+    // The value as string. For the empty string, you may use special_value.
     string string_value = 4;
     // The value is a special value (e.g. NULL or the empty string)
     SpecialValue special_value = 5;