I've been playing around with the drupal taxonomy module. Why doesn't XML2005 show up under conferences?
I found the SIOC schema... it seems to create aliases for several widely-known terms. Ugh. I wonder why. update... the SIOC folks are aware of this and are discussing the relationship with foaf and skos. And it uses multiple domains as if the meaning was the disjunction, despite resolution of the issue of What should the semantics of multiple domain and range properties be?