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XHTML Tutorial - XHTML and SGML Relation

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What Is the Relation between XHTML and SGML?

SGML (Standard Generalized Markup Language) is a metalanguage in which one can define markup languages, like HTML, for documents. SGML is a descendant of IBM's Generalized Markup Language (GML), developed in the 1960s by Charles Goldfarb, Edward Mosher and Raymond Lorie (whose surname initials also happen to be GML).

XHTML is not directly related to SGML. But it is indirectly to SGML through HTML.

For more information on SGML, please visit http://www.isgmlug.org/sgmlhelp/g-index.htm.

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1. What Is XHTML?
2. What Does an XHTML Document Look Like?
3. What Is the Relation between XHTML and HTML?
4. What Is the Relation between XHTML and XML?
5. What Is the Relation between XHTML and the Web?
6. What Is the Relation between XHTML and HTTP?
7. What Is the Relation between XHTML and URL?
8. What Is URI?
9. What Is the Relation between XHTML and SGML?
10. What Is the Relation between XHTML and CSS?
11. What Is the Relation between XHTML and DTD?
12. Who Developed XHTML?
13. What Is the Latest XHTML Specification?
14. How Many Tags Are Defined in XHTML 1.0?
15. How To Validate XHTML Documents Online?
16. What Tools to Use to Write XHTML Documents?
17. What Tools to Use to View XHTML Documents?