Directory Tree Representations

I often want to include example directory trees in my documentation.   
I've extended Docbook 5 to add the obvious tags (directory, disk,  
file) that can nest in the obvious way and include 'name' and  
'description' tags, and I've modified the XSL stylesheets to produce  
nice PDF/HTML representations, like so:

http://geraintnorth.com/docbook_directories.pdf

This seems too generic and useful to keep to myself - is there a  
route whereby these could be considered for inclusion in Docbook  
itself, or some domain-specific subclass thereof?  I'm very new to  
the Docbook community, so please forgive me if this has been raised  
millions of times before. :-)

Thanks,

Geraint North
Principal Engineer
Transitive