[rules-users] Rule of rules

Is it possible to write rule of rules with Drools ? e.g. I write two complex rules in drools and then I want a third rule that can be defined to process facts 1. which passed both rule 1 and rule 2 OR 2. which passed rule 1 but not rule 2 OR 3. which passed rule 2 but not Rule 1 OR 4. which did not pass rule 1 and rule 2 and so on .. Kind of a new 'layer' on top of drools .. ? I can think of a crud way, that is to flag the fact object when it passed rule 1 and rule 2 and check the flag in rule 3 .. but am looking for a more sophisticated way using drools features .. -ahbay