XHTML 1.0 can also be served as XML, and XHTML 1.1 is always served as XML. To serve XHTML as XML you use one of the MIME types application/xhtml+xml, application/xml or text/xml. The W3C recommends that you serve XHTML as XML using only the first of these MIME types - ie. application/xhtml+xml.
The fact that XHTML may be served as HTML or XML makes a difference to the way encoding information needs to be declared, as we will see shortly.
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