These are the XSL stylesheets for DocBook XML and "Simplified" DocBook
DTDs. Use these stylesheets for documents based on DocBook 4 and
earlier; they are not aware of the namespace feature.

The stylesheets transform DocBook documents into HTML, XHTML, Manpages,
XSL-FO (for PDF), and a few other formats.

XSL is a standard W3C stylesheet language for both print and online
rendering. For more information about XSL, see the XSL page at the W3C:
http://www.w3.org/Style/XSL/