OWL Last Call Working Drafts Published The Web Ontology Working Group has released six Working Drafts, five in Last Call, for the OWL Web Ontology Language 1.0, including the OWL Guide, Overview, Use Cases and Requirements, Semantics and Abstract Syntax, Reference, and Test Cases. Comments are welcome through 9 May. OWL is used to publish and share sets of terms called ontologies, providing advanced Web search, software agents and knowledge management.