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DocBook.orgDocBook 5: The Definitive Guide is Copyright © 2010 Norman Walsh.
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Version 1.4.9 is DocBook 5: The Definitive Guide. It is a “work in progress” and purports to document DocBook V5.1b8.
The current OASIS Standard version of DocBook is V5.0. Documentation for DocBook V5.0 is also available.
Jiří Kosek built a Microsoft HTML Help version of V1.3.