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File: Data.xml
<?xml version="1.0"?>
<catalog>
<item id="SC-0001">
<maker>factory</maker>
<description>car part</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:output doctype-system="catalog.dtd" />
<xsl:template match="catalog">
<xsl:copy>
<xsl:apply-templates select="item">
<xsl:with-param name="discount" select="'0.50'" />
</xsl:apply-templates>
</xsl:copy>
</xsl:template>
<xsl:template match="item">
<xsl:param name="discount" />
<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="price - (price * $discount)" />
</discountPrice>
<xsl:copy-of select="currency" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE catalog
SYSTEM "catalog.dtd">
<catalog>
<item id="SC-0001">
<maker>factory</maker>
<description>car part</description>
<size>L</size>
<price>120.00</price>
<discount>0.50</discount>
<discountPrice>60</discountPrice>
<currency>USD</currency>
</item>
</catalog>
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