The pretty printer (written by Warren Hedley) is a collection of XSLT stylesheets that convert XML to HTML or LaTeX basically providing XML syntax highlighting.
The stylesheets have vanished from physiome.org.nz so they are mirrored here. No support can be given.
There is documentation in the tarball. For xsltproc users just use "xsltproc -o output stylesheet input-xml".
Example: The jabberd 1.4.x pages use the pretty printer here.