John Boyer; Roland Merrick. <a href="http://www.w3.org/TR/2004/NOTE-xforms-11-req-20040831"><cite>XForms 1.1 Requirements.</cite></a> 31 August 2004. W3C Note. URL: <a href="http://www.w3.org/TR/2004/NOTE-xforms-11-req-20040831">http://www.w3.org/TR/2004/NOTE-xforms-11-req-20040831</a>