Shape and colour (NOT style stuff) in DocBook 5

[Martin Holmes <mholmes@uvic.ca>]

Hi there,

I need to store information about an object which has shape and colour 
attributes in a DocBook 5 document. This is NOT a question about mixing 
display and data, so don't flame me please; the data itself includes 
information about colour and shape, and I'm looking for a standard way 
to encode this in DocBook attributes or elements, if possible without 
abusing existing tags. Does anyone have any suggestions?

Cheers,
Martin