The SGML, HTML, & XML
Both HTML and XML are derived from the Standard Generalized
Markup Language (SGML).
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HTML: Loose syntax and structure, some tags
HTML uses a non-strict version of SGML's syntax and
structure and a limited set of SGML tags for identifying
logical types of text blocks (paragraphs, headings, etc.)
for presentation.
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XML: Strict syntax and structure only
XML uses a strict form of SGML syntax and structure,
which can be used to create whole new sets of tags
according to the informational and logical needs of a
particular situation.
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SGML/HTML/XML Family Tree
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Resources
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