Ray Whitmer. <a href="http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226"><cite>Document Object Model (DOM) Level 3 XPath Specification.</cite></a> 26 February 2004. W3C Note. URL: <a href="http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226">http://www.w3.org/TR/2004/NOTE-DOM-Level-3-XPath-20040226</a>