Hey Frank, It's not perfect but it should serve the purpose and is far preferable to the alternatives I was considering. Thanks very much! Cheers, Derek -- View this message in context: http://drools.46999.n3.nabble.com/use-of-enum-with-in-on-LHS-tp3997081p3997238.html Sent from the Drools: User forum mailing list archive at Nabble.com.