Change these global parameter values
File: Data.xml
<x>
<input>7</input>
<input>27</input>
</x>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="text" indent="yes" version="1.0" />
<xsl:param name="parInput_1" select="x/input[1]" />
<xsl:param name="parInput_2" select="x/input[2]" />
<xsl:template match="x">
<xsl:param name="total">
<xsl:call-template name="y">
<xsl:with-param name="z" select="$parInput_2" />
</xsl:call-template>
</xsl:param>
<xsl:value-of select="$total - $parInput_1" />
</xsl:template>
<xsl:template name="y">
<xsl:param name="z" select="$parInput_2" />
<xsl:value-of select="$z" />
</xsl:template>
</xsl:stylesheet>
Output:
20
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