File: Data.xml
<?xml version="1.0"?>
<catalog>
<item id="0001">
<maker>factory</maker>
<description>device</description>
<size>L</size>
<price>120.00</price>
<currency>USD</currency>
</item>
</catalog>
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="xml" indent="yes" />
<xsl:variable name="discount" select="document('discount.xml')" />
<xsl:template match="catalog">
<xsl:copy>
<xsl:apply-templates select="item" />
</xsl:copy>
</xsl:template>
<xsl:template match="item">
<xsl:copy>
<xsl:attribute name="id"><xsl:value-of select="@id" />
</xsl:attribute>
<xsl:copy-of select="maker|description|size|price" />
<discount>
<xsl:value-of select="$discount" />
</discount>
<discountPrice>
<xsl:value-of
select="format-number(price - (price*$discount),'###.00')" />
</discountPrice>
<xsl:copy-of select="currency" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?>
<catalog>
<item id="0001">
<maker>factory</maker>
<description>device</description>
<size>L</size>
<price>120.00</price>
<discount/>
<discountPrice>NaN</discountPrice>
<currency>USD</currency>
</item>
</catalog>
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