Thanks for your response.

I don't think contains will work in this case.  I need to match if a collection contains one, and only one, of another collection.  So " ('a','b','c') contains one of ('a','b','e') " should not match, where "('a','b','c') contains ('a','2','3')" should match.

Dave Cracauer

On Aug 23, 2008, at 8:31 AM, Scott Burrows wrote:

You have the answer in your example, reserved word "contains" will give you that information.

Scott Burrows

On Sat, Aug 23, 2008 at 9:23 AM, David Cracauer <> wrote:

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)


View this message in context:
Sent from the drools - user mailing list archive at

rules-users mailing list

rules-users mailing list