Jeremy J. Carroll; Jeff Z. Pan. <a href="http://www.w3.org/TR/2006/NOTE-swbp-xsch-datatypes-20060314"><cite>XML Schema Datatypes in RDF and OWL.</cite></a> 14 March 2006. W3C Note. URL: <a href="http://www.w3.org/TR/2006/NOTE-swbp-xsch-datatypes-20060314">http://www.w3.org/TR/2006/NOTE-swbp-xsch-datatypes-20060314</a>