private function isResultVariable($variable, $variableClassUri)
    {
        $responseVariableClass = \taoResultServer_models_classes_ResponseVariable::class;
        $outcomeVariableClass = \taoResultServer_models_classes_OutcomeVariable::class;
        $class = isset($variable->class) ? $variable->class : get_class($variable->variable);

        return (null != $variable->item ||  null != $variable->test)
            && (
                $class == $outcomeVariableClass
                && $variableClassUri == $outcomeVariableClass
            ) || (
                $class == $responseVariableClass
                && $variableClassUri == $responseVariableClass
            );
    }