Support for language tags and ranges when displaying LDAP entries via
Redesign of plug-in API:
Plug-in classes for pre-input, post-input actions at entry level
which makes it possible to implement attribute actions which depend
on other entry data (e.g. autogeneration/composition of attribute values).
Plug-in classes will be limited to a certain scope
by configuration (e.g. by matching LDAP URL).