public function getNodeValue($nodeName, $itemNum = 0, $extraTextBefore = '', $extraTextAfter = '')
    {
        $node = $this->getElementsByTagName($nodeName)->item($itemNum);
        if (isset($node)) {
            $texto = html_entity_decode(trim($node->nodeValue), ENT_QUOTES, 'UTF-8');

            return $extraTextBefore . $texto . $extraTextAfter;
        }

        return '';
    }