Related to the discussion of using vocabs that might not be maintained, there will be an entire day dedicated to these kinds of questions at the Dublin Core conference in Lisbon in September, 2013. http://wiki.dublincore.org/index.php/VocDay_workshop_in_Lisbon kc -- Karen Coyle [log in to unmask] http://kcoyle.net ph: 1-510-540-7596 m: 1-510-435-8234 skype: kcoylenet