[rules-users] Can I check if a collection contains one, and only one item of another collection

[David Cracauer]

Hi,
I'm getting stuck on this and I'm hoping someone can help.. 
I need to be able to check that a collection contains one, and only one item
from another collection.

Ideally, I would do something like this:

 a:Answer(responses contains one of ("a","b","c"));

Is there a way do do this without resorting to evals or predicate
expressions? (drools 4.07)

Thanks,
Dave



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