Jonathan Marsh. <a href="http://www.w3.org/TR/2002/WD-xml-names11-req-20020403"><cite>Namespaces in XML 1.1 Requirements.</cite></a> 3 April 2002. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2002/WD-xml-names11-req-20020403">http://www.w3.org/TR/2002/WD-xml-names11-req-20020403</a>