DOCBOOK-APPS: No callout numbers in the code with programlistingco

I am working on a pretty big project to convert a large documentation
base over to DocBook, and it's my responsibility to figure out what works
and what doesn't when transforming the DocBook 4.1 code into a rendered
format.  Thus far, my biggest problem has been with <programlistingco>
not showing the callout numbers in line with the code.  The callouts that
come after the <programlisting> block work fine, but no matter how I
transform the original DocBook, there are never corresponding numbers in
the code.

I have a feeling that something is wrong with some part of the software I
am using, but I do not know what.  In the archives for this list, I found
a message where Norman Walsh posted code along with rendered documents
where the use of <programlistingco> worked quite well.  (The message is
http://lists.oasis-open.org/archives/docbook-apps/200103/msg00337.html.)
   When I try to run FOP 0.20.3rc on the included cotest.xml, I get no
callout numbers with the code.  The same is true if I run xsltproc to
generate FO for XEP or to generate HTML.  In other words, using the same
source XML file, I get different results than Norman.

The relevant versions of software I am using are as follows:

     * libxslt 1.0.12 (compiled against libxml2 2.4.15)
     * FOP 0.20.3rc
     * docbook-xsl-1.48
     * docbook-dsssl-1.74b

Is there some step I am forgetting?  Is there a better XSLT tool than
xsltproc from libxslt to use?  I've attached the offending use of
<programlistingco> in case it might provide some other useful
information.  Thanks.

   -Patrick


-- 
Patrick L. Hartling                     | Research Assistant, VRAC
                | 2624 Howe Hall -- (515)294-4916
http://www.137.org/patrick/             | http://www.vrac.iastate.edu/