Hi Jevon,
Read number 17 in our FAQ: http://www.jessrules.com/jess/FAQ.shtml#Q17
The right way to write your final rule might be something like this,
depending on what kind of facts these are:
(defrule debug-four
(BooleanPropertyImpl (OBJECT ?property))
(PageImpl (OBJECT ?container))
(test (progn
(bind ?children (get-member ?container children)))
(member$ ?property ?children)))
=>
((System.out) println "...")
)
On Mar 4, 2011, at 2:18 AM, Jevon Wright wrote:
Hi all,
I am trying to write a Jess rule program to perform inference on an
EMF-based model instance. I can successfully load all of the model
elements into Jess, and check that these facts all exist:
(defrule debug-one
?property <- (BooleanPropertyImpl)
=>
((System.out) println "Found property:")
((System.out) println ?property)
)
This rule works fine, and all of the BooleanPropertyImpl in the model
are found successfully. But I am having trouble with accessing members
of the elements, using either get-member, or call, or bind.
(defrule debug-three
?container <- (BooleanPropertyImpl)
(bind ?name (get-member ?container name))
=>
((System.out) println "Found name:")
((System.out) println ?name)
)
I expect this to bind object.getName() to ?name, but instead the
parse fails:
Jess reported an error in routine Jesp.parsePattern.
Message: Bad slot value at token '('.
Program text: ( defrule debug-three ?container <- (
BooleanPropertyImpl ) ( bind ?name ( at line 44 in file
rules/jess-test.clp.
at jess.Jesp.error(Unknown Source)
What does this mean? Is this a syntax error? Is this an error with my
Java objects? Am I missing a runtime library? Should I be importing
other packages? I can't think of any other way to approach this
problem.
The reason I am using get-member is that I was trying to see if an
elements' List contains another element:
(defrule debug-four
?property <- (BooleanPropertyImpl)
?container <- (PageImpl)
(bind ?children (get-member ?container children)))
(member$ ?property ?children)
=>
((System.out) println "...")
)
However, this also fails with the exception above. Any ideas or
suggestions would be most welcome. :)
Thanks
Jevon
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