[docbook-apps] DocBook XSL Stylesheets + rootid + PDF problem

[paul at kitebird dot com]

I'm trying to use the rootid parameter with the DocBook XSL stylesheets,
but have run into a problem with regard to producing PDF documents.
In summary, I have no problem when rootid is the ID for a <chapter>. But
when when rootid is the ID for a <section>, the resulting FO file makes
FOP die.  I've tried to narrow this down to a minimal test case below.

Here is a small input file, junk.xml, that demonstrates the problem:

----------
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd";>
<book lang="en">
 <title id="title-book">Book Title</title>

 <chapter id="chapter">
  <title id="title-introduction">Chapter Title</title>

  <para>Chapter para.</para>

  <section id="section">
   <title id="title-section">Section Title</title>

   <para>Section para.</para>

  </section>

 </chapter>

</book>
----------

The goal here is to produce one output document from the <chapter>
and one from the <section>, in both HTML and PDF output formats.

Here is a shell script that does these things:
- Formats the <chapter> as HTML (this works)
- Formats the <section> as HTML (this works)
- Formats the <chapter> as PDF (this works)
- Formats the <section> as PDF (this fails at the FOP step)

docbook://xsl-current/fo/docbook.xsl is mapped in my catalog file to version
1.66.1 of the DocBook XSL stylesheets. (Note: I've also tried with 1.67.0
with the same result.)

----------
INPUT=junk.xml
xsltproc \
    --novalid \
    --stringparam rootid chapter \
    --output chapter.html \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT

xsltproc \
    --novalid \
    --stringparam rootid section \
    --output section.html \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT

xsltproc \
    --novalid \
    --stringparam rootid chapter \
    --param fop.extensions 1 \
    --output chapter.fo \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
fop -q chapter.fo chapter.pdf

xsltproc \
    --novalid \
    --stringparam rootid section \
    --param fop.extensions 1 \
    --output section.fo \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
fop -q section.fo section.pdf
----------

The result of running the script is as follows:

% sh -v test-cmds
INPUT=junk.xml
xsltproc \
    --novalid \
    --stringparam rootid chapter \
    --output chapter.html \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
Making portrait pages on USletter paper (8.5inx11in)

xsltproc \
    --novalid \
    --stringparam rootid section \
    --output section.html \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
Making portrait pages on USletter paper (8.5inx11in)

xsltproc \
    --novalid \
    --stringparam rootid chapter \
    --param fop.extensions 1 \
    --output chapter.fo \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
Making portrait pages on USletter paper (8.5inx11in)
fop -q chapter.fo chapter.pdf
[ERROR] property - "background-position-horizontal" is not implemented yet.
[ERROR] property - "background-position-vertical" is not implemented yet.
<34 similar lines deleted>
[ERROR] property - "background-position-horizontal" is not implemented yet.
[ERROR] property - "background-position-vertical" is not implemented yet.

xsltproc \
    --novalid \
    --stringparam rootid section \
    --param fop.extensions 1 \
    --output section.fo \
    docbook://xsl-current/fo/docbook.xsl \
    $INPUT
Making portrait pages on USletter paper (8.5inx11in)
fop -q section.fo section.pdf
[ERROR] property - "background-position-horizontal" is not implemented yet.
[ERROR] property - "background-position-vertical" is not implemented yet.
<34 similar lines deleted>
[ERROR] property - "background-position-horizontal" is not implemented yet.
[ERROR] property - "background-position-vertical" is not implemented yet.
[ERROR] null


Ah, the so-informative "null" error. :-(

I suppose the problem could be either in the stylesheets or in FOP
(or with myself, of course), but I'm uncertain how to proceed here.
Any suggestions appreciated.  Thanks.