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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="/">
<xsl:for-each select="//number">
<xsl:value-of select="."/>
<xsl:choose>
<xsl:when test="position()=last()">
<xsl:text> = </xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text> + </xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
<xsl:value-of select="sum(//number)"/>
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?>1 + 3 + 4 + 17 + 8 + 11 = 44
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