OWL 2 Web Ontology Language Primer (Second Edition) publication history Date Status 11 December 2012 Recommendation 18 October 2012 Proposed Edited Recommendation 27 October 2009 Recommendation 22 September 2009 Proposed Recommendation 11 June 2009 Last Call Working Draft 21 April 2009 Working Draft 11 April 2008 Working Draft