[rules-users] Accumulate function

Hi all, i am going to use a custom accumulate function like that: rule "CrowdInAreaEvent-event" no-loop when $RFIDReader : SensorFixed(type == Sensor.SENSOR_TYPE_RFID, $coverageArea : areaOfInterest ) not CrowdInAreaEvent( sensor == $RFIDReader, this meets[ 5s ] $obs ) $count : Integer( intValue > 10 ) from accumulate( $obs : RFIDObservation( $tagid : tagid, sensor == $RFIDReader ) over window:time( 60s ) from entry-point lowLevelSensorStream, countDistinct( $tagid ) ); then insert( SituationManager.createCrowdInAreaEvent( "Crowd, number people: " + $count, Event.THREAT_LOW, $coverageArea, $RFIDReader, $count, 60, 10 ) ); end I need to refer $obs object in order to compare timing of new observation with last event. Is it possible to do that? Thanks a lot, Matteo.