DOCBOOK: Docbook "user exit"?

[Ng Pheng Siong <ngps@netmemetic.com>]

Hi, 

I'm writing my second Python programming HOWTO in Docbook. Naturally, my
Docbook file contains fragments of Python code. There exist neat Python
code colourisers and I want to use one of these on my docu to produce
prettier output.

Is there a "user exit" mechanism in Docbook to allow me to call said code
colouriser?

I'm invoking Jade thusly:

    jade -V nochunks -d /.../html/docbook.dsl f.docbook > f.html


TIA. Cheers.

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-- 
Ng Pheng Siong <ngps@netmemetic.com> * http://www.netmemetic.com