The documentation on the 'and' Conditional Element seems to imply that these constructs are equivalent:

                $p1:Entity($code1:code)
                not (and
                        $p2:Entity(code == $code1)
                         eval(MyStaticClass.match($p1, $p2))
                )

                $p1:Entity($code1:code)
                not (
                        $p2:Entity(code == $code1)
                        and eval(MyStaticClass.match($p1, $p2))
                )

Actually, the first version crashes with this message:

unknown:93:7 Unexpected token 'and'[96,2]: unknown:96:2 mismatched token: [@792,3685:3685=')',<12>,96:2]; expecting type THEN

I'm on drools 4.0.2 and mvel14-1.2.8.

Alexandre

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