I finally suceeded to get what I wanted using the keyword accumulate which is really very poweful as said in the doc. Here is the rule: http://drools.pastebin.com/m4f938e40
It is a little bit complex, but it perfectly works. The only observation I have is that it seems drools compatible jdk is < 1.5, since I tryed to declare my linkedlist this way: LinkedList<Alarm>(), but got warnings about the unexpected '<'. One other thing, the "implicit and" does not work in the accumulate, you have to put it clearly. Now I have something giving me the list I need, all should be easy I think. Do you have any observation on the way I did it? Cheers Aldian _______________________________________________ rules-users mailing list rules-users@lists.jboss.org http://lists.jboss.org/mailman/listinfo/rules-users