The documentation can be built as html, for pdf, the images will
not look too good (size)

The default is to build with xsltproc

To build with saxon (and enable syntax highlighting):
saxon6-5-5.zip from http://saxon.sourceforge.net/
xslthl-2.0.0.jar from http://xslthl.wiki.sourceforge.net/
docbook-xsl-snapshot.zip from http://docbook.sourceforge.net/snapshots/ 1.73.2 is known to work
http://www.apache.org/dist/xerces/j/Xerces-J-bin.2.9.1.zip