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The Standard Generalized Markup Language (SGML) is an ISO specification made for defining declarative markup languages.

On the web, HTML 4, XHTML, and XML are popular SGML-based languages. It is worth noting that since its fifth edition, HTML is no longer SGML-based and has its own parsing rules.

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 Contributors to this page: hbloomer, andy1633, Jeremie, Andrew_Pfeiffer, klez, Biraj, teoli, avsaro
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