The curly braces enclose simple patterns
<http://herzberg.ca.sandia.gov/jess/docs/70/rules.html#patterns_simple>, which
are available starting in 7.0.
Assigning variable ?cs twice seems redundant in your example.
?cs <- (CreditScore {ProgramGroup == "PG" && linkType == "Lt" && cs >= 100})
would do the same more simply.
It also looks like "cs >= 100" should have been "score >= 100" so that
"(score (- (score 3)))" could have been "(score (- (?score 3)))".
Bob Kirby
At 01:29 PM 5/30/2007, Radu Razvan Slavescu wrote:
>Hello,
>
>I'm reading a paper on Jess and the following code is given:
>
>(defrule "rule 1" ; q1
> ?cs <- (CreditScore {ProgramGroup == "PG" &&
> linkType == "Lt"}) ;;q2
> ?cs <- (CreditScore{cs >= 100})
>=>
> (modify ?cs (score (- (score 3)))) ; q3
>)
>
>Even if not told, CreditScore seems to be an unordered fact. I found no
>such a syntax either on the book "Jess in action" or on the Jess web site
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