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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:template name="minMax">
<xsl:param name="nodes" as="node()*" />
<xsl:param name="min-so-far" select="number('INF')"
as="xs:double" />
<xsl:param name="max-so-far" select="number('-INF')"
as="xs:double" />
<xsl:choose>
<xsl:when test="count($nodes) gt 1">
<xsl:variable name="first">
<xsl:call-template name="minMax">
<xsl:with-param name="nodes"
select="subsequence($nodes, 1, count($nodes) idiv 2)" />
</xsl:call-template>
</xsl:variable>
<xsl:variable name="second">
<xsl:call-template name="minMax">
<xsl:with-param name="nodes"
select="subsequence($nodes, (count($nodes) idiv 2) + 1)" />
</xsl:call-template>
</xsl:variable>
<xsl:document>
<min>
<xsl:value-of
select="if(number($first/min) lt number($second/min))
then $first/min
else $second/min" />
</min>
<max>
<xsl:value-of
select="if(number($first/max) gt number($second/max))
then $first/max
else $second/max" />
</max>
</xsl:document>
</xsl:when>
<xsl:when test="count($nodes) eq 1">
<xsl:document>
<min>
<xsl:value-of select="$nodes[1]" />
</min>
<max>
<xsl:value-of select="$nodes[1]" />
</max>
</xsl:document>
</xsl:when>
<xsl:otherwise>
<xsl:document>
<min>INF</min>
<max>-INF</max>
</xsl:document>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="/">
<result>
<xsl:call-template name="minMax">
<xsl:with-param name="nodes"
select="/booklist/book/price" />
</xsl:call-template>
</result>
</xsl:template>
</xsl:stylesheet>
Output:
<?xml version="1.0" encoding="UTF-8"?><result><min>6.99</min><max>12.99</max></result>
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