[rules-users] rules execution on Collection

Hello Droolers, Here is my Scenario: public class Parties { protected List<Party> party; .... } public class Party { protected IdentificationGroup idGroup; } public class IdentificationGroup { protected String partyType; } I have a collection of "Party" objects in the statefulsession. I want to find in the collection whether there is a partyType of "SELLER" . In Object Graph notation it will be something like Parites[0].idGroup.partyType is "SELLER". If not found execute the consequence. Your help is very much appreciated.