FOP & DocBook error

Thank you all for the guidance.  I am running

When I attempt to convert a simple docbook xml file to pdf, the 
following errors occur.  I am not sure how to correct this.  Has anyone 
had this error? For simple xml files, a PDF is made.  For large complex 
docbooks, no PDF is made.

Vitals :
OSX 10.3.6
docbook-xml-4.2
fop-0.20.5
docbook-xsl-1.66.1

  echo $CLASSPATH
/sw/share/java/saxon/saxon-jdom.jar:
/sw/share/java/saxon/saxon.jar:
:
../software/docbook-xsl-1.66.1/extensions/saxon651.jar:
../software/fop-0.20.5/build/fop.jar:
../software/fop-0.20.5/lib/batik.jar:
../software/fop-0.20.5/lib/xalan-2.4.1.jar:
../software/fop-0.20.5/lib/xercesImpl-2.2.1.jar:
../software/fop-0.20.5/lib/avalon-framework-cvs-20020806.jar:
../software/fop-0.20.5/lib/jai_core.jar:
../software/fop-0.20.5/lib/jai_codec.jar

I truly appreciate the helpful docbook group.  Thank you.


Cheers,

Tristan
------------------------------
Tristan J. Fiedler
Postdoctoral Fellow - Stein Lab
Cold Spring Harbor Laboratory


fiedler$ java org.apache.fop.apps.Fop -xml test.xml -xsl 
~//software/docbook-xsl-1.66.1/fo/docbook.xsl -pdf test2.pdf

[INFO] Using com.icl.saxon.aelfred.SAXDriver as SAX2 Parser
[INFO] FOP 0.20.5
[INFO] Using com.icl.saxon.aelfred.SAXDriver as SAX2 Parser
[INFO] building formatting object tree
[INFO] setting up fonts
Making portrait pages on USletter paper (8.5inx11in)
[ERROR] property - "background-position-horizontal" is not implemented 
yet.
[ERROR] property - "background-position-vertical" is not implemented 
yet.
[ERROR] property - "background-position-horizontal" is not implemented 
yet.