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XHTML: Crossroads of HTML and XML

By now we all know what HTML is. The collection of tags was made famous by the Web, or was it the other way around? Tim Berners-Lee is credited with inventing HTML and the Web, but they were not completely original inventions, as the ideas of hypertext and metatags abounded in Gopher and document-management systems that were based on SGML (Standardized General Markup Language).

http://www.networkcomputing.com/1122/1122ws1.html