Daniel Engovatov; Daniel Engovatov. <a href="http://www.w3.org/TR/2007/WD-xquery-11-requirements-20070323"><cite>XML Query (XQuery) 1.1 Requirements.</cite></a> 23 March 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-xquery-11-requirements-20070323">http://www.w3.org/TR/2007/WD-xquery-11-requirements-20070323</a>