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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: Biraj, Jeremie, andy1633, klez, teoli, Andrew_Pfeiffer, avsaro
    Last updated by: andy1633,