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| | XHTML 1.0: The Extensible HyperText Markup Language (Second Edition) (Site not responding. Last check: 2007-10-23) |
 | | It is intended to be used as a language for content that is both XML-conforming and, if some simple guidelines are followed, operates in HTML 4 conforming user agents. |
 | | HTML 4 [HTML4] is an SGML (Standard Generalized Markup Language) application conforming to International Standard ISO 8879, and is widely regarded as the standard publishing language of the World Wide Web. |
 | | A DTD, or document type definition, is a collection of XML markup declarations that, as a collection, defines the legal structure, elements, and attributes that are available for use in a document that complies to the DTD. |
| www.w3.org /TR/xhtml1 (5149 words) |
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