Jeremy C. Reed wrote:

> The docbook package provides some stylesheets that may work or give some 
> ideas. See /usr/pkg/share/xsl/docbook/manpages/.

While this is true, I think those stylesheets are intended for writing
man pages in DocBook and then converting them to something the native
man(1) can process. They are probably not usable to turn _any_ DocBook
file into a *roff file:

  <!-- * if document does not contain at least one refentry, then emit a -->
  <!-- * message and stop -->


ciao
     Klaus