The idea is to say , we encounter a certain entity in a  in a in a utterance. So le let 's look up everything we  the ontology gives us about that entity , what stuff it does , what roles it has , what parts , whatever it has. Functions. And , then we look in the discourse , whether any of that , or any surface structure corresponding to these roles , functions aaa  has ever occurred.
Oh , OK.
And then , the discourse history can t tell us , " yeah " , or " no ".
OK.