<dd><cite><a href="http://www.w3.org/TR/1999/REC-html401-19991224">HTML 4.01 Specification</a></cite>, W3C Recommendation, Dave Raggett, Arnaud Le Hors, Ian Jacobs, 24 December 1999.<br />
<dd><cite><a href="http://www.w3.org/TR/2000/REC-xhtml1-20000126">XHTML 1.0: The Extensible HyperText Markup Language</a></cite>, W3C Recommendation, Steven Pemberton, et al., 26 January 2000.<br />
<dd><cite><a href="http://www.w3.org/TR/2001/REC-xhtml-modularization-20010410">Modularization of XHTML</a></cite>, W3C Recommendation, Murray Altheim, et al., 10 April 2001<br />
<dd><cite><a href="http://www.w3.org/TR/2000/REC-xml-20001006">Extensible Markup Language (XML) 1.0 (Second Edition)</a></cite>, W3C Recommendation, Tim Bray, Jean Paoli, C. M. Sperberg-McQueen, Eve
<dd><cite><a href="http://www.w3.org/TR/2001/REC-ruby-20010531">Ruby Annotation</a></cite>, W3C Recommendation, Marcin Sawicki, et al., 31 May 2001.<br />
<dd>"<cite><a href="http://www.ietf.org/rfc/rfc2119.txt">Key words for use in RFCs to indicate requirement levels</a></cite>", RFC 2119, S. Bradner, March 1997.<br />
Available at: http://www.ietf.org/rfc/rfc2119.txt</dd>
<dd>"<cite><a href="http://www.w3.org/TR/1999/REC-xml-names-19990114">Namespaces in XML</a></cite>", W3C Recommendation, Tim Bray, Dave Hollander, Andrew Layman, 14 January 1999.<br />
Available at: http://www.w3.org/TR/1999/REC-xml-names-19990114</dd>
</dl>
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