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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