OWL 2 is a Proposed Recommendation

With more than a dozen implementations of OWL 2 reported, the W3C OWL Working Group has published its OWL 2 Web Ontology Language as a Proposed Recommendation. OWL 2 is a compatible extension to OWL 1, providing additional features for people using ontologies. The OWL 2 document set contains 13 documents, of which 4 are instructional: overview, primer, new features and rationale, and quick reference. The rdf:PlainLiteral datatype, developed for use by OWL 2 and RIF, is also a Proposed Recommendation.