High Quality Content by WIKIPEDIA articles! XHTML5 is the XML serialisation of HTML5. XHTML5 must be served with an XML MIME type: application/xhtml+xml . XHTML5 requires strict well-formed syntax. XML (Extensible Markup Language) is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards. XML's design goals emphasize simplicity, generality, and usability over the Internet. It is a textual data format, with strong support via Unicode for the languages of the world. Although XML's design focuses on documents, it is widely used for the representation of arbitrary data structures, for example in web services.

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