subtraction and multiplication uses common syntax : Math « XSLT stylesheet « XML Tutorial

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File: Data.xml

<?xml version="1.0" encoding="utf-8"?>
<data>
    <number>1</number>
    <number>3</number>
    <number>4</number>
    <number>17</number>
    <number>8</number>
    <number>11</number>
</data>

File: Transform.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
      version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

    <xsl:template match="/">
      <Paragraph>
        <xsl:value-of select="//number[1]"/>
        <xsl:text> + </xsl:text>
        <xsl:value-of select="//number[2]"/>
        <xsl:text> = </xsl:text>
        <xsl:value-of select="//number[1] + //number[2]"/>
      </Paragraph>
      <Paragraph>
        <xsl:value-of select="//number[3]"/>
        <xsl:text> - </xsl:text>
        <xsl:value-of select="//number[4]"/>
        <xsl:text> = </xsl:text>
        <xsl:value-of select="//number[3] - //number[4]"/>
      </Paragraph>
      <Paragraph>
        <xsl:value-of select="//number[5]"/>
        <xsl:text> * </xsl:text>
        <xsl:value-of select="//number[6]"/>
        <xsl:text> = </xsl:text>
        <xsl:value-of select="//number[5] * //number[6]"/>
      </Paragraph>
    </xsl:template>
</xsl:stylesheet>
Output:

<?xml version="1.0" encoding="UTF-8"?><Paragraph>1 + 3 = 4</Paragraph><Paragraph>4 - 17 = -13</Paragraph><Paragraph>8 * 11 = 88</Paragraph>