The "IPTC Core" and the "IPTC Extension" schema for XMP provide a well defined and extensively documented set of metadata primarily for photographer's use built on Adobe's XMP technology. This group is open to the public and aims at supporting the use of XMP for IPTC's photo metadata
More generic issues about photo metadata should be discussed at the IPTC Photo Metadata Yahoo Forum http://groups.yahoo.com/group/iptc-photometadata
Appendix to my posting below: Wondering where the xmpRights prefix comes from I checked the Adobe XMP spec documents from 2004, 2005 and 2008: all include a
In the IPTC Core version 1.1 of July 2009, the XMP implementation for the 'Rights Usage Terms' is given (on page 21) as: xmpRights:UsageTerms. And yet, in all
Carl Thanks for your considerations. first: this grouping of properties is only a guideline for the use of properties but not relevant at the technical level.
The Property Group for Iptc4xmpExt:Event is "admin" Might "descr" be a better choice? Although Event is temporal and thus associated with the admin property