public function getDOMDocument()
    {
        if ($this->domDocument instanceof DOMDocument === false) {
            $this->domDocument = new DOMDocument('1.0', 'UTF-8');

            libxml_clear_errors();
            $previousSetting = libxml_use_internal_errors(true);

            @$this->domDocument->loadXML($this->response->getBody());

            libxml_clear_errors();
            libxml_use_internal_errors($previousSetting);
        }

        return $this->domDocument;
    }