Currently there are two datatypes provided:
- Unique string (based on Text line system datatype),
- Unique URL (based on URL system datatype).
Use these if you want to make sure that a given attribute of a given
class never accepts/stores two identical values.
Note: uniqueness is validated within the same attribute only, which means
that if you use the datatype in two different classes, it will become
two independent attributes resulting in two independent uniqueness
sets! This may be changed/enhanced in the future.
Note:
# Versions 0.1-0.3 (strings), 0.1-0.4 (URLs):
Uniqueness is validated globally, which means it will not skip content objects
that are drafts, in trash, or unpublished versions! However, multiple
versions of the same content object may store the same value (in
fact, it would not work otherwise).
# Versions 0.4+ (string), 0.5+ (URLs):
New feature for strings available: possible to check current versions
only.
# For backward compatibility set: CurrentVersionOnly=false