Docbook customization layer for the DDP

Is there any docbook customization layer for the DDP?  I noticed (for
example) that the HTML output generated by the standard DocBook
stylesheets is invalid (it is in fact HTML 4.01 Transitional but tagged
as HTML 3.2).  Moreover it would be possible to have a more standard
look-and-feel of the documents, and standardize things such as encoding
and so on.

Is there anything like that/is anybody working on it?  Do you feel such
a thing is necessary at all?

Aaron Isotton                                 [ http://www.isotton.com ]
-- 
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