Handle an extension function.
@param ns the URI of namespace in which the function is needed
@param funcName the function name being called
@param argVec arguments to the function in a vector
@param methodKey a unique key identifying this function instance in thestylesheet
@param exprContext a context which may be passed to an extension functionand provides callback functions to access various areas in the environment
@return result of executing the function
@throws javax.xml.transform.TransformerException
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