15. The method of claim 1 , wherein the rule is a first rule from a group of rules in which all rules in the group of rules are based on a same composite event structure, and wherein the first rule from the group of rules is a different rule than a second rule from the group of rules.
31. A machine-readable storage medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 15 .