[rules-users] Writing complicated rules - consecutive number problem

I am trying to write a rather complicated rule via the guided rule editor and I wonder if it is indeed possible. The following is a simplified explanation of my scenario: A 'person' has a numerical property 'age' In a hypothetical world the following is allowed because the ages of the people are consecutive: Person A age = 24 Person B age = 25 Person C age = 26 OK Person D age = 27 However I would like to write a rule that fires if the ages are not consecutive, something like this: Person A age = 24 Person B age = 25 Person C age = 29 NOT OK Person D age = 27 I am starting with 'From collect all people [p]'. Any thoughts, comments or similar experiences much apprieciated as I am pulling my hair out! Jen -- View this message in context: http://drools.46999.n3.nabble.com/Writing-complicated-rules-consecutive-n... Sent from the Drools: User forum mailing list archive at Nabble.com.