Hello, Is there a way to add meta-attributes to a class ? Like BeforeAfterMetaclasses approaches or hooks. The underlying use case is to synchronize XWiki objects with a backend repository. A typical approach is to have the following attributes automatically changed or incremented on object change : lastmodificationdate, lastsynchronization, uptodateSequenceNumber, highwatermark... Or do you see another way for synchronization ? Thanks ! Oliver -- View this message in context: http://www.nabble.com/Changing-BaseClass-to-put-metadatas---tf3946533.html#… Sent from the XWiki- Dev mailing list archive at Nabble.com.