To validate as XHTML-MP, a document must contain a proper [[Document Type Declaration]],<ref>{{Cite web|title = Example Domain|url = http://example.com/|website = example.com|accessdate = 2015-09-21}}</ref> or DOCTYPE, depending on the version of specification followed
<source lang="xml">
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN"
"http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.1//EN"
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.
