James Clark. <a href="http://www.w3.org/TR/2001/WD-xslt11-20010824"><cite>XSL Transformations (XSLT) Version 1.1.</cite></a> 24 August 2001. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2001/WD-xslt11-20010824">http://www.w3.org/TR/2001/WD-xslt11-20010824</a>