XLSXWriter::buildAppXML PHP Метод

    protected function buildAppXML()
    {
        $app_xml = "";
        $app_xml .= '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>' . "\n";
        $app_xml .= '<Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/extended-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><TotalTime>0</TotalTime></Properties>';
        return $app_xml;
    }