This is a known bu... ah, "idiosyncrasy" of Jess that I've mentioned
here before. To access a defglobal on the LHS of a rule, you need to
use the (get-var) function :
(test (call (get-var *NodeClass*) isInstance ?node))
I think Dave Carlson wrote:
>
> This out-of-context example from my XML code posted earlier appears to be a
> bug with the 'call' function. As shown here, the parser throws an error for
> this rule, but I believe it's valid code.
>
> (defglobal ?*NodeClass* = (call java.lang.Class forName "org.w3c.dom.Node"))
>
> (defrule GetFirstChild
> (Node (firstChild ?node))
> (test (call ?*NodeClass* isInstance ?node))
> =>
> (definstance Node ?node)
> )
>
> Rete Exception in routine ReteCompiler::eval.
> Message: Unbound variable found in funcall: *NodeClass* at line 24: ( defrul
> e GetFirstChild ( Node ( firstChild ?node ) ) ( test ( call ?*NodeClass* isInsta
> nce ?node ) ) = > ( definstance Node ?node ) ) .
> at java.lang.Throwable.<init>(Compiled Code)
> at java.lang.Exception.<init>(Compiled Code)
> at jess.ReteException.<init>(ReteException.java:26)
> at jess.ReteCompiler.compilerError(ReteCompiler.java:830)
> at jess.ReteCompiler.eval(Compiled Code)
> at jess.ReteCompiler.addRule(Compiled Code)
> at jess.Rete.addDefrule(Compiled Code)
> at jess.Jesp.doParseDefrule(Compiled Code)
> at jess.Jesp.parseDefrule(Compiled Code)
> at jess.Jesp.parseSexp(Compiled Code)
> at jess.Jesp.parse(Compiled Code)
> at jess.Main.main(Compiled Code)
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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