This is an implementation of syntax highlighting as an extension module for XSLT processors (Xalan, Saxon), so if you have e.g. article about programming written in DocBook, code examples can be automatically syntax highlighted during the XSLT processing phase.

From https://sourceforge.net/projects/xslthl/.

See:

• http://web.archive.org/web/20210304124637/https://sourceforge.net/projects/xslthl/
• http://web.archive.org/web/20210304124036/https://sourceforge.net/p/xslthl/wiki/Home/