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3488Re: What is the XML? Someone.....

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  • tgalloca
    May 28, 2004
      Extensible Markup Language

      It is similar to HTML.

      XML is the Extensible Markup Language. It is designed to improve the
      functionality of the Web by providing more flexible and adaptable
      information identification.

      It is called extensible because it is not a fixed format like HTML
      (a single, predefined markup language). Instead, XML is actually a
      `metalanguage' —a language for describing other languages—which lets
      you design your own customized markup languages for limitless
      different types of documents. XML can do this because it's written in
      SGML, the international standard metalanguage for text markup systems
      (ISO 8879).


      SGML is the Standard Generalized Markup Language (ISO 8879:1985), the
      international standard for defining descriptions of the structure of
      different types of electronic document. There is an SGML FAQ at
      http://lamp.man.deakin.edu.au/sgml/sgmlfaq.txt which is posted every
      month to the comp.text.sgml newsgroup, and the SGML Web pages are at
      http://xml.coverpages.org/.

      SGML is very large, powerful, and complex. It has been in heavy
      industrial and commercial use for over a decade, and there is a
      significant body of expertise and software to go with it. XML is a
      lightweight cut-down version of SGML which keeps enough of its
      functionality to make it useful but removes all the optional features
      which make SGML too complex to program for in a Web environment.
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