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XPath 2.0 is used as the rule engine expression language. XPath supports the definition of external (i.e., user defined) functions and variables. These external functions are invoked via the p6IXpathVariables connector object. This connector object is implemented by the calling application. This method can be called multiple times before each call to evaluate(). This feature is optional, but is an excellent way for the calling application to extend what the rule engine can do and the data it can read and write.
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