refentry to man does not transform tables in man pages

Bonjour,

I am using xsltproc and docbook-xsl/manpages/docbook.xsl to convert man pages 
from DocBook XML to man (groff).

Unfortunately we have tables (!) in a number of our man pages.

Before embarking in an (hopeless) effort to write the transformation (I am 
neither a guru for XSLT, or troff/nroff/groff), I am asking if any of you have 
already written something like that? 

Merci,

Tilly