XLSXWriter::buildCoreXML PHP Method

    protected function buildCoreXML()
    {
        $core_xml = "";
        $core_xml .= '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>' . "\n";
        $core_xml .= '<cp:coreProperties xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">';
        $core_xml .= '<dcterms:created xsi:type="dcterms:W3CDTF">' . date("Y-m-d\\TH:i:s.00\\Z") . '</dcterms:created>';
        //$date_time = '2014-10-25T15:54:37.00Z';
        $core_xml .= '<dc:creator>' . self::xmlspecialchars($this->author) . '</dc:creator>';
        $core_xml .= '<cp:revision>0</cp:revision>';
        $core_xml .= '</cp:coreProperties>';
        return $core_xml;
    }