To validate as XHTML-MP, a document must contain a proper Document Type Declaration, (DTD) or DOCTYPE, depending on the version of specification followed
Note that a series of revisions have been issued to correct technical errors in the above DTDs, and the DTD format is more complex and less widely supported than that of standard HTML.
The MIME type for XHTML Mobile Profile is "application/vnd.wap.xhtml+xml". Conforming user agents should also accept "application/xhtml+xml" and "text/html". Many desktop browsers will only validate XHTML-MP at the display time, if an XML MIME type is specified.
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"XHTML Basic 1.1, W3C Recommendation 29 July 2008". World Wide Web Consortium. 2008-07-29. Retrieved 2010-05-06. http://www.w3.org/TR/2008/REC-xhtml-basic-20080729 ↩