P. Stark; M. Baker. <a href="http://www.rfc-editor.org/rfc/rfc3236.txt"><cite>The 'application/xhtml+xml' Media Type.</cite></a> January 2002. Internet RFC 3236. URL: <a href="http://www.rfc-editor.org/rfc/rfc3236.txt">http://www.rfc-editor.org/rfc/rfc3236.txt</a>