Norman Walsh. <a href="http://www.w3.org/TR/2005/NOTE-xlink10-ext-20050127"><cite>Extending XLink 1.0.</cite></a> 27 January 2005. W3C Note. URL: <a href="http://www.w3.org/TR/2005/NOTE-xlink10-ext-20050127">http://www.w3.org/TR/2005/NOTE-xlink10-ext-20050127</a>