This may be of interest http://www.commontag.org/ There's also some interesting discussion on the W3C public-lod mailing list, especially on questions around interoperability with other existing ontologies in this space. Thread starts with http://lists.w3.org/Archives/Public/public-lod/2009Jun/0145.html Pete --- Pete Johnston Technical Researcher, Eduserv [log in to unmask] +44 (0)1225 474323 http://www.eduserv.org.uk/research/people/petejohnston/ http://efoundations.typepad.com/