One of the coolest applications of Rete out there in the wild right now is that they have a Rete engine built in to Apache Jena, which operates on RDF. (I do no

One of the coolest applications of Rete out there in the wild right now is that they have a Rete engine built in to Apache Jena, which operates on RDF. (I do not believe its unique to Jena, inference seems to be part of the whole RDF ontology schema thing.) So, now your knowledge base is RDF nodes. I have not yet had a chance to play with it myself, but when I was playing with RDF and turned down that corridor in surprise: "Oh my, what. have. we. here!" I think it's pretty neat.