SGML

DocBook 4.3 is the current SGML version of DocBook. Earlier versions are for legacy and historical interest, use of older versions is strongly discouraged.

DocBook Schemas
What Is DocBook?
SGML 
DocBook SGML 4.4CR4
DocBook SGML 4.4CR3
DocBook SGML 4.4CR2
DocBook SGML 4.4CR1
DocBook SGML 4.4b2
DocBook SGML 4.4b1
DocBook SGML 4.3
DocBook SGML 4.2
DocBook 4.1
DocBook 3.1
XML
RELAX NG
W3C XML Schema
DocBook NG
Specifications
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