Hashtables

[Grzegorz Chrupała]

Hi,
I can't find anything about hashtables in the Oz documentation. Are they 
not supported?

Without hashtables I'm having a hard time performing seemingly simple 
tasks such as determining distributions of n-grams, chunks or 
constructions in corpora etc. 

BTW, I know about Dictionaries, but they only allow atoms or integers as 
keys.

Any advise appreciated.
-- 
Grzegorz Chrupała