How to Generate Excel with XSLT

<xsl:stylesheet version="1.0"
    xmlns="urn:schemas-microsoft-com:office:spreadsheet"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt"
    xmlns:user="urn:my-scripts"
    xmlns:o="urn:schemas-microsoft-com:office:office"
    xmlns:x="urn:schemas-microsoft-com:office:excel"
    xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" >  
   

    <xsl:template match="/">
        <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
            xmlns:o="urn:schemas-microsoft-com:office:office"
            xmlns:x="urn:schemas-microsoft-com:office:excel"
            xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
            xmlns:html="http://www.w3.org/TR/REC-html40">
           
            <Styles>
                <Style ss:ID="Default" ss:Name="Normal">
                    <Alignment ss:Vertical="Bottom"/>
                    <Borders/>
                    <Font/>
                    <Interior/>
                    <NumberFormat/>
                    <Protection/>
                </Style>
                <Style ss:ID="s21">
                    <Font ss:Bold="1"/>
                    <Alignment ss:Horizontal="Center" ss:Vertical="Bottom"/>
                </Style>
                <Style ss:ID="s22">
                    <Alignment ss:Horizontal="Center" ss:Vertical="Bottom"/>
                    <Font ss:Bold="1"/>
                    <Interior ss:Color="#99CCFF" ss:Pattern="Solid"/>
                </Style>
                <Style ss:ID="s23" ss:Name="Currency">
                    <NumberFormat
                        ss:Format="_(&quot;$&quot;* #,##0.00_);_(&quot;$&quot;* \(#,##0.00\);_(&quot;$&quot;* &quot;-&quot;??_);_(@_)"/>
                </Style>
                <Style ss:ID="s24">
                    <NumberFormat ss:Format="_(* #,##0.00_);_(* \(#,##0.00\);_(* &quot;-&quot;??_);_(@_)"/>
                </Style>
                <Style ss:ID="s25">
                    <Alignment ss:Horizontal="Center" ss:Vertical="Bottom"/>
                </Style>
            </Styles>
           
            <Worksheet>
                <xsl:attribute name="ss:Name">
                    <xsl:value-of select='concat("Order #", "Customer")'/>
                </xsl:attribute>
                <Table ss:ExpandedColumnCount="3">
                    <xsl:attribute name="ss:ExpandedRowCount" >
                        <xsl:value-of select="10"/>
                    </xsl:attribute>
                   
                    <Column ss:AutoFitWidth="0" ss:Width="150"/>
                    <Column ss:AutoFitWidth="0" ss:Width="100"/>
                    <Column ss:AutoFitWidth="0" ss:Width="75"/>
                   
                    <Row>
                        <Cell ss:StyleID="s21"><Data ss:Type="String">Item</Data></Cell>
                        <Cell ss:StyleID="s21"><Data ss:Type="String">Quantity</Data></Cell>
                        <Cell ss:StyleID="s21"><Data ss:Type="String">Total</Data></Cell>
                    </Row>
                   
                    <Row>
                        <Cell ss:Index="2"><Data ss:Type="String">Subtotal</Data></Cell>
                        <Cell ss:StyleID="s23" ss:Formula="=SUM(R8C:R[-1]C)"/>
                    </Row>
                    <Row>
                        <Cell ss:Index="2"><Data ss:Type="String">Freight</Data></Cell>
                        <Cell ss:StyleID="s23"><Data ss:Type="Number"><xsl:value-of select="20000"/></Data></Cell>
                    </Row>
                    <Row>
                        <Cell ss:Index="2"><Data ss:Type="String">Total</Data></Cell>
                        <Cell ss:StyleID="s23" ss:Formula="=R[-2]C+R[-1]C"/>
                    </Row>
                </Table>
            </Worksheet>
        </Workbook>
       
    </xsl:template>

</xsl:stylesheet>