Excel an XML format

Another example:

    <?xml version="1.0"?>
    <?mso-application progid="Excel.Sheet"?>
    <Workbook
        xmlns:x="urn:schemas-microsoft-com:office:excel"
        xmlns="urn:schemas-microsoft-com:office:spreadsheet"
        xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
        <Styles>
            <Style ss:ID="s21">
                <Font
                    ss:Color="#FF0000"
                    ss:Bold="1"/>
            </Style>
        </Styles>
        <Worksheet ss:Name="Sheet1">
            <Table ss:ExpandedColumnCount="2" ss:ExpandedRowCount="4">
                <Row ss:Index="4">
                    <Cell ss:Index="2" ss:StyleID="s21">
                        <Data ss:Type="String">hello, world</Data>
                    </Cell>
                </Row>
            </Table>
        </Worksheet>
    </Workbook>