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Chapter 29. The Future of the Dynamic Web > Extensible Markup Language (XML)

Extensible Markup Language (XML)

The Standard Generalized Markup Language (SGML) is the grandfather of most markup languages used for both print and the Internet. SGML is the international standard used to define the structure and appearance of documents. Different SGMLs have been created for a variety of document types and for different specialties, such as physics, accounting, and chemistry. HTML is the Web's version of SGML. Compared with full-blown SGML, however, HTML is lacking in several key areas.

Most notably, HTML does not allow you to tell the browser anything about the information in the document except, to a very limited extent, in <meta> tags (see "Educating the Browser" in Chapter 24).


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