[plt-scheme] Unicode Categories

Hi,

Is there any way to know if a character is in a unicode category?

Something like:
(mem-unicode-cat? c cat)
c : char?
cat : symbol?

cat represents a unicode category and returns #t iff c is a character
in the category represented by cat.

If something like this is not available, is there straightforward way
of implementing it? [since I don't want to spend too much time looking
into unicode stuff]

Cheers,

-- 
Paulo Jorge Matos - pocmatos at gmail.com
Webpage: http://www.personal.soton.ac.uk/pocm