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File: Data.xml
<?xml version="1.0" encoding="iso-8859-1"?>
<booklist>
<book>
<title>title 1</title>
<author>author 1</author>
<publisher>publisher 1</publisher>
<isbn>1-11-11111-1</isbn>
<price>6.99</price>
<sales>235</sales>
</book>
<book>
<title>title 2</title>
<author>author 2</author>
<publisher>publisher 2</publisher>
<isbn>0 14 018967 X</isbn>
<price>12.99</price>
<sales>12</sales>
</book>
</booklist>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs" version="2.0">
<xsl:key name="pub" match="book" use="publisher" />
<xsl:variable name="in" select="/" />
<xsl:variable name="publishers" as="xs:string*"
select="distinct-values(/booklist/book/publisher)" />
<xsl:template match="/">
<html>
<head>
<title>Sales volume by publisher</title>
</head>
<body>
<h1>Sales volume by publisher</h1>
<table id="{generate-id(.)}">
<tr>
<th>Publisher</th>
<th>Total Sales Value</th>
</tr>
<xsl:for-each select="$publishers">
<tr>
<td>
<xsl:value-of select="." />
</td>
<td>
<xsl:call-template name="total-sales" />
</td>
</tr>
</xsl:for-each>
</table>
</body>
</html>
</xsl:template>
<xsl:template name="total-sales">
<xsl:param name="publisher" select="." />
<xsl:value-of select="sum($in/key('pub',$publisher)/sales)" />
</xsl:template>
</xsl:stylesheet>
Output:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Sales volume by publisher</title>
</head>
<body>
<h1>Sales volume by publisher</h1>
<table id="d2">
<tr>
<th>Publisher</th>
<th>Total Sales Value</th>
</tr>
<tr>
<td>publisher 1</td>
<td>235</td>
</tr>
<tr>
<td>publisher 2</td>
<td>12</td>
</tr>
</table>
</body>
</html>
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