Robin Berjon. <a href="http://www.w3.org/TR/2006/NOTE-rex-reqs-20060202"><cite>Remote Events for XML (REX) Requirements.</cite></a> 2 February 2006. W3C Note. URL: <a href="http://www.w3.org/TR/2006/NOTE-rex-reqs-20060202">http://www.w3.org/TR/2006/NOTE-rex-reqs-20060202</a>