Asir S. Vedamuthu; Mary Holstege. <a href="http://www.w3.org/TR/2008/WD-xmlschema-ref-20081117"><cite>W3C XML Schema Definition Language (XSD): Component Designators.</cite></a> 17 November 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-xmlschema-ref-20081117">http://www.w3.org/TR/2008/WD-xmlschema-ref-20081117</a>