[rules-users] Accepted idiom for binding variable to restriction?

I have a fact that is inserted into my rule base. It is a Response. A Response has a Question that it is a response to. At the moment, the Question itself is not separately inserted into the knowledge base. I would ideally like to keep it this way. What's the best approach for binding variables to both the Response and its associated Question? That is, if the Question were inserted, it would be relatively easy: when $question : Question( ) $response : Response( question == $question ) ...but I'm finding myself somewhat confused how to "extract" a Question out of a Response, particularly when, say, I want to "select" only Responses whose associated Question IDs are "XYZ": when $response : Response( $question : question.ID == "XYZ" ) // boy howdy does this seem wrong Is the easiest thing to do here to add a second rule that just inserts the questions: when $response : Response then insert($response.getQuestion()) end ...? I would love to stay away from this if I could. Thanks, Laird