One interesting problem is how to handle metadata for image collages. We would need the possibility to copy all metadata from all source images to the composite. To enable this we need a new XMP bag-container.
For keywords he would like to see parent-child relations (a type of three hierarchy). This could be implemented as an alternative field that shows the relation between keywords. By this implementation we can do this without breaking the current keyword function.
We also need a new type of field for all those keywords that are not true keywords. The keyword field is heavily used for process and handling instructions (archive, retouch, re-scan). Peter suggests a bag-container with note fields for this kind of labeling.
He also suggest alternate metadata sets for different uses, users and alternate renderings. More or less a type of versioning system. This makes it possible for the image editor or distributor to add and modify captions and keyword and still leaving the original metadata from the photographer.
You can read more about Peter Krogh here
Notes from the first Photo Metadata Conference. This conference was held in Florence, Italy june 7, 2007. It was organized by Cepic, IPTC and IFRA. These are my private notes published to give you some idea of what was discussed. I will later write some articles from the conference and publish those on BLF.se and DigitalFotografen.se, but probably only in Swedish. If there are any demand I might make a short translated version in English. You can find presentations and more information at phmdc.org and cepic.org .