[Zope] How do I get a uniqueValuesFor() a subset of the catalog?

[Philip Aylesworth]

I am trying to get a list of unique values for one particular meta_type.
The uniqueValuesFor() works great but is there a way to get unique
values for a subset of data such as meta_type='car' then
uniqueValuesFor('make') would list the makes of cars but not of
toasters?

I was thinking that I could use multiple cataloges but that seems like a
real pain.

Phil.

-- 
Philip Aylesworth                          
paylesworth@stclaircollege.ca