public function setEncodingMethod($use)
    {
        if (!in_array($use, array(SOAP_ENCODED, SOAP_LITERAL))) {
            require_once 'Zend/Soap/Client/Exception.php';
            throw new Zend_Soap_Client_Exception('Invalid message encoding method. Use SOAP_ENCODED or SOAP_LITERAL constants.');
        }

        $this->_use = $use;

        $this->_soapClient = null;

        return $this;
    }