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Extensible Markup Language (XML) became a W3C recommendation in February 1998, and has since become very popular for data exchange on the internet (see web service languages SOAP and WSDL).

XML is a markup language similar to HTML, but unlike HTML, the author must write his own tags (often using a DTD or XSD). These XML tags describe data, instead of displaying it. Many of the languages created for use in the Semantic Web have been built on XML, so syntactical knowledge of XML is useful.

See also