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File: Data.xml
<math>
<down>
<operand>12.12</operand>
<operand>23.22</operand>
</down>
<up>
<operand>12.15</operand>
<operand>23.73</operand>
</up>
</math>
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:output method="text" />
<xsl:template match="math">
<xsl:apply-templates select="up|down" />
</xsl:template>
<xsl:template match="up|down">
<xsl:value-of select="round(sum(operand))" />
<xsl:text> </xsl:text>
</xsl:template>
</xsl:stylesheet>
Output:
35 36
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