This may be of interest to some.
"At its annual general meeting held in Tokyo last week, more than 50 IPTC [International Press Telecommunications Council] delegates from around the world unanimously approved publication of the Photo Metadata White Paper. It outlines photo work flow at many types of agencies that buy, sell and use images, and offers crucial suggestions for expanding the amount and types of metadata that are embedded in photos. The white paper targets the entire photo industry, not just journalists."
Press release: http://www.iptc.org/pages/prel_20070606.php PDF of full document: http://www.iptc.org/goto?phmdwp2007