Ben Chang; Rezaur Rahman; Joe Kesselman. <a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Val-20040127"><cite>Document Object Model (DOM) Level 3 Validation Specification.</cite></a> 27 January 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Val-20040127">http://www.w3.org/TR/2004/REC-DOM-Level-3-Val-20040127</a>