Is there any easy way of handling cross references?

I am looking to do a transform to create a legal document where each 
paragraph is a numbered clause (handled by styles in the form of 1, 2, 
3, 3(i), 3(ii), 3(iii)(a), 3(iii)(b), etc) and need to include a 
facility where one clause might contain a reference to another clause 
and the number of clauses in between might vary.

Has anyone come across this problem before/found a solution?
-- 
Cheers,

Julian Voelcker
United Kingdom