James Tauber; Joel Nava. <a href="http://www.w3.org/TR/1999/NOTE-xml-canonical-req-19990605"><cite>XML Canonicalization Requirements.</cite></a> 5 June 1999. W3C Note. URL: <a href="http://www.w3.org/TR/1999/NOTE-xml-canonical-req-19990605">http://www.w3.org/TR/1999/NOTE-xml-canonical-req-19990605</a>