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   The other way is to use the DocBook stylesheets directly. The
   DocBook DTDs are shipped with Forrest and automatically
   handled. However, you will need to have the DocBook stylesheets on
   your system (they are too massive to ship with Forrest) and
   configure Forrest accordingly. You will need to create a "sitemap"
   as explained in Using Forrest and add matches to handle your
   DocBook documents, e.g.
   [snip!]
   You can also use a mixture of the two methods, some handled
   automatically by Forrest and some directly using DocBook
   stylesheets. You can also have a mixture of "document-v*" DTD and
   DocBook.

For those who doesn't know what Apache Forrest is, here's the blurb: 
   Forrest is an XML standards-oriented project documentation
   framework based on Apache Cocoon, providing XSLT stylesheets and
   schemas, images and other resources. Forrest uses these to render
   the XML source content into a website via command-line, robot, or a
   dynamic web application.