private function interpretResponseXML()
    {
        $this->debug_echo("\n\nResponse (xml):\n".$this->state['response']['body_raw']);

        $this->state['response']['body'] = $this->state['response']['body_raw'];

        if ($this->state['response']['code'] < 200 ||
            $this->state['response']['code'] >= 300
        ) {
            $this->handleHttpError();
        }

        return $this->state;
    }