How to put texinfo directory information into docbook manual

Hello -

   I'm working with the plplot project to try and fix up their info file 
generation from their docbook manual.  Currently it doesn't generate a 
directory category and the  summary line is:

START-INFO-DIR-ENTRY
* The PLplot Plotting Library: .   ???
END-INFO-DIR-ENTRY


I'd like it to be as follows:

INFO-DIR-SECTION Scientific Visualization
START-INFO-DIR-ENTRY
* PLplot: (plplotdoc).               The PLplot Plotting Library.
END-INFO-DIR-ENTRY

with the file called plplotdoc.info.

After reading the info pages for docbook2X I tried the following in the 
plplotdoc.xml file:


<book id="plplot-docbook">
   <bookinfo>
     <title>The PLplot Plotting Library</title>
     <abbrev>DocBook</abbrev>
     <subtitle>Programmer's Reference Manual</subtitle>
     <releaseinfo>Version 5.0</releaseinfo>
     <titleabbrev role="texinfo-node">PLplot</titleabbrev>
     <abstract role="texinfo-node">
       The PLplot Plotting Library
     </abstract>
     <subjectset scheme="texinfo-directory">
       <subject><subjectterm>Scientific 
Visualization</subjectterm></subject>
     </subjectset>


but that didn't appear to have any effect.

I'm afraid I know nothing about docbook and any help would be greatly 
appreciated.

Thanks!

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  [email protected]
Boulder, CO 80301              http://www.cora.nwra.com

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