I have create a rule for recommending books:
(defrule recommend-book "recommend the book" (book (name ?name)(price ?price)(publisher oreilly)(keyword Java)) (not (book (price ?p&:(< ?p ?price)))) => (assert(recommend (name ?name)(price ?price))) )
In my Java program I am creating a facts catalog similar to the program (listing 18.1/page 312)in the book Jess in action.
The listing of my facts in the working memory looks like this:
==> f-1 (MAIN::book (name "Java for beginners") (keyword "Java") (publisher "oreilly") (price 15))
==> f-2 (MAIN::book (name "New Java for beginners") (keyword "Java") (publisher "manning") (price 20))
==> f-3 (MAIN::book (name "Java for experts") (keyword "Java") (publisher "oreilly") (price 30))
==> f-4 (MAIN::book (name "Java for intermediate") (keyword "Java") (publisher "oreilly") (price 35))
My rules are not firing for the above facts.
However, when I create a fact
engine.executeCommand("(assert (book (name samplebook)(price 14)(keyword Java)(publisher oreilly)))");
and the fact looks like this in the working memory
==> f-5 (MAIN::book (name samplebook) (keyword Java) (publisher oreilly) (price 14))
The only difference I see is that the new fact and the original fact is " " - (keyword "Java") vs (keyword Java).
Is Jess behaving correctly. How do I create a fact without the quotes.
Thanks Rajani
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