Ben Chang; et al. <a href="http://www.w3.org/TR/2002/NOTE-DOM-Level-3-AS-20020725"><cite>Document Object Model (DOM) Level 3 Abstract Schemas Specification.</cite></a> 25 July 2002. W3C Note. URL: <a href="http://www.w3.org/TR/2002/NOTE-DOM-Level-3-AS-20020725">http://www.w3.org/TR/2002/NOTE-DOM-Level-3-AS-20020725</a>