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HTML is powerful but does not separate display and form (structure of document component as an object)
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XML is a generalization of HTML which allows definition of arbitrary tags
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e.g. <student name="Jane Doe" class="CPS616" grade="..." >Working Hard</student> is more elegant way of capturing information in a reliable fashion than HTML
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<h2>Students</h2> <ul><li>Jane Doe: Working Hard</li><ul> <li>Class: CPS616</li> <li>Grade: ...</li> .... </ul> </ul> with a PERL program to extract data
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XML allows powerful way of defining dynamic Ascii databases useful for "modest size data" such as people, document citations etc.
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XML parsers map XML tags into HTML for display
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XML can also be used to define extensions to HTML such as special tags for mathematics or chemistry or .....
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XML defines syntax for "serializing" Web objects and transmitting between clients and servers
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