here is no requirement for XHTML 1.0 documents to be
compatible with existing user agents, in practice this is easy to
accomplish. Guidelines for creating compatible documents can be
found in <a href="#guidelines">Appendix&#160;C</a>.</p>

<h2><a name="media" id="media">5.1 Internet Media Type</a></h2>
<p>As of the publication of this recommendation, the general
recommended MIME labeling for XML-based applications
has yet to be resolved.</p>

<p>However, XHTML Documents which follow the guidelines set forth