2008-04-11: Merged namespaces for dc and dcterms, now using dcterms (dc:subject becomes dcterms:subject). Changed domain of sioc:content, sioc:attachment and sioc:note to sioc:Item. Changed domain and range of sioc:sibling to sioc:Item. Removed domain of sioc:num_replies. Dropped sioc:Forum as domain and range for sioc:scope_of and sioc:has_scope respectively.