[rules-users] Temporal operators for point-in-time events

Apologies for the stupid question, but I haven't seen anything in the documentation regarding this and I want to verify my solution. Say I have a point-in-time event (i.e., duration of 0) that I want to correlate to another point-in-time event. I want a rule that will activate if the timestamp of one is greater than or equal to the other, basically "after or coincides". I wrote a test using the following rule and it seemed to work: rule "Greater Than or Equal" when $e1 : TestEvent( $id : id ) $e2 : TestEvent( id != id, this after[0ms] $e1 ) then System.out.println($e2 + " is greater than or equal to " + $e1); end I realize this rule will fire twice if the event timestamps are equal, but it's just for demonstration purposes; my question is specifically about the "after[0ms]" part. Is this the way to go to accomplish what I need? It seems so simple but I have this annoying feeling that I'm missing something. On a slightly related topic, is there an updated version of the temporal operators image from the Drools Fusion homepage? It is a great visual description of the operators and I want to print it out and post it at my desk, but it doesn't include all of the operators. Image: http://www.jboss.org/drools/drools-fusion/mainColumnParagraphs/02/imageBi... Thanks Mike