[rules-users] forall with nested collections

Hello, I'm pretty new to Drools hence i apologize if my question is newbie but i'm getting crazy. I'm trying to write a functioning query since yesterday without fortune. I have data about vehicles owned by person organized for year. My structure is: VechicleData |___VehicleYearData |____Vehicle I have inserted in Drools only the root of the hierarchy (VehicleData) because insert all objects has been problematic for me. Now i need to check if a person has all vehicle of the same make. I have tried this: $result: PersonData( $id: identifierCode ) forall ( ($o: VehicleData( ownerIdentifierCode == $result.identifierCode )) && ($y: VehicleYearData( ) from $o.data) && ($v: VehicleEntity( ) from $y.vehicleEntity) ) VehicleEntity( this == $v, make == "BMW" ) ) and this: PersonData( $id: identifierCode ) $list: List( ) from accumulate ( (and $o: VehicleData( ownerIdentifierCode == $id ) $y: VehicleYearData( ) from $o.data $e: VehicleEntity( ) from $y.vehicleEntity ), collectList( $e ) ) forall ( $v: VehicleEntity( ) from $list VehicleEntity( this == $v, make == "BMW" ) ) and many other... Someone can help me?? Thank you. Andrea -- View this message in context: http://drools.46999.n3.nabble.com/forall-with-nested-collections-tp402957... Sent from the Drools: User forum mailing list archive at Nabble.com.