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The relationship between XML, SGML, and HTML

Specific language instance
Year
Meta language
(ratified standard)
1986
SGML
1992
HTML 1.0
browser driven expansion
1995
HTML 2.0
1997
HTML 3.2
1998
XML
HTML 4.0
formatting progressively
managed by style sheets
(affected tags deprecated)

1999
2000
XLink
XLS ...
XHTML 1.0
2001
XMLSchema ...
XHTML 1.1
and beyond
future revisions

Figure 4.5: The relationship between XML, SGML, and HTML;
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