public function getDefaultStrategy()
    {
        $strategy = $this->_defaultStrategy;
        if (is_string($strategy) && class_exists($strategy)) {
            $strategy = new $strategy;
        }
        if (!($strategy instanceof Zend_Soap_Wsdl_Strategy_Interface)) {
            /**
             * @see Zend_Soap_Wsdl_Exception
             */
            require_once "Zend/Soap/Wsdl/Exception.php";
            throw new Zend_Soap_Wsdl_Exception(
                "Default Strategy for Complex Types is not a valid strategy object."
            );
        }
        $this->_defaultStrategy = $strategy;
        return $strategy;
    }