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Why to switch to DocBook V5.0

DocBook V4.x is feature frozen
DocBook V5.0 offers new functionality
- annotations
- more flexible linking system
- unified info markup
DocBook V5.0 is more extensible
- thanks to namespaces it can be easily mixed with other vocabularies like SVG, MathML, XHTML or even FooBarML
- DocBook V5.0 is easier to customize
  - RELAX NG based customizations are much more easier and faster to create then DTD based