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Reference.org
General-purpose markup language
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<p>A general-purpose markup language is a <a href="/facts/Markup_language/WwhlNVIu">markup language</a> that is used for more than one purpose or situation. Other, more specialized <a href="/facts/Domain-specific_language/n18H1foD">domain-specific</a> markup languages are often based upon these languages. For example, <a href="/facts/HTML/sSc3fT78">HTML 4.1</a> and earlier are domain-specific markup languages (for webpages), and are based on the syntax of <a href="/facts/SGML/euIKXwHV">SGML</a>, which is a general-purpose markup language. </p>