It reads a lot like a special purpose logic programming language, almost as if it has a prolog engine built in. Expert systems generally use logic programming.

It reads a lot like a special purpose logic programming language, almost as if it has a prolog engine built in. Expert systems generally use logic programming. I think that's what the GP means. Rules engines are something different AFAICT, (all I get on Google is business related stuff) and seem to use forward chaining, and I'm not sure how you'd get Inform-like behavior with that.