public function serialize(array $array, array $properties = null)
    {
        $xmlVersion   = '1.0';
        $xmlEncoding  = 'UTF-8';
        $standalone   = Utilities::tryGetValue($properties, self::STANDALONE);
        $defaultTag   = Utilities::tryGetValue($properties, self::DEFAULT_TAG);
        $rootName     = Utilities::tryGetValue($properties, self::ROOT_NAME);
        $docNamespace = Utilities::tryGetValue(
            $array,
            Resources::XTAG_NAMESPACE,
            null
        );

        if (!is_array($array)) {
            return false;
        }

        $xmlw = new \XmlWriter();
        $xmlw->openMemory();
        $xmlw->setIndent(true);
        $xmlw->startDocument($xmlVersion, $xmlEncoding, $standalone);

        if (is_null($docNamespace)) {
            $xmlw->startElement($rootName);
        } else {
            foreach ($docNamespace as $uri => $prefix) {
                $xmlw->startElementNS($prefix, $rootName, $uri);
                break;
            }
        }

        unset($array[Resources::XTAG_NAMESPACE]);
        self::arr2xml($xmlw, $array, $defaultTag);

        $xmlw->endElement();

        return $xmlw->outputMemory(true);
    }