public function getObject(array $parameters = array())
    {
        if ($this->url === null) {
            throw new \InvalidArgumentException('Missing URL.');
        }

        if ($this->endpoint === null) {
            $this->endpoint = $this->discover($this->url);
        }

        $sign = '?';
        if ($query = parse_url($this->endpoint, PHP_URL_QUERY)) {
            $sign = '&';

            parse_str($query, $parameters);
        }

        if (!isset($parameters['url'])) {
            $parameters['url'] = $this->url;
        }
        if (!isset($parameters['format'])) {
            $parameters['format'] = 'json';
        }

        $client = new Client(
            sprintf('%s%s%s', $this->endpoint, $sign, http_build_query($parameters))
        );

        $data = $client->send();

        switch ($parameters['format']) {
            case 'json':
                $data = json_decode($data);
                if (!is_object($data)) {
                    throw new \InvalidArgumentException('Could not parse JSON response.');
                }

                break;

            case 'xml':
                libxml_use_internal_errors(true);
                $data = simplexml_load_string($data);
                if (!$data instanceof \SimpleXMLElement) {
                    $errors = libxml_get_errors();
                    $error  = array_shift($errors);
                    libxml_clear_errors();
                    libxml_use_internal_errors(false);
                    throw new \InvalidArgumentException($error->message, $error->code);
                }

                break;
        }

        return Object::factory($data);
    }