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XML is also an SGML application, but since XML is extensible (XML is also a metalanguage), every XML document must be accompanied by its DTD
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XML is a compromise between the non-extensible, limited capabilities of HTML and the full power and complexity of SGML
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XML offers "80% of the benefits of SGML for 20% of its complexity"
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XML designers tried to leave out all the SGML that would be rarely used on the web
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Note that XML specification is 30 pages and the SGML specification is 500 pages.
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XML allows you to define your own tags and to describe nested hierarchies of information.
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