Tools for generating Docbook programlisting fragments?

Do anyone know of a library for generating DocBook programlisting  
fragments from
source code listings marked up with special comments.
The purpose is to generate the Docbook source and program language  
source,
from a common specification. I've tested filtering a xml file  
containing a programlisting
DocBook element through a custom stylesheet, but so far I've been  
unable to avoid
getting extra whitespace, when doing it this way.

----------------------------------
Skinheads are so tired of immigration, that they are going to move to  
a country that don't accept immigrants!
Tommy Nordgren