The Extensible Markup Language (XML) is a subset of the Standard Generalised Markup Language (SGML), the standard for creating markup documents. Unlike HTML, another markup language based on SGML, XML allows you to describe data and its structure rather than display it. XML is not a replacement for HTML, but compliments it by allowing the author to describe their own tags. XML is extensible as the author can create an unlimited number of tags. There are no predefined tags in XML.
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