Re: [xsl] selecting nodes based on sibling values

Subject: Re: [xsl] selecting nodes based on sibling values
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Tue, 23 Nov 2010 16:09:14 +0100
Fabien Tillier wrote:

<data>
	<row>
		<level>40</level>
		<keycode>1254.45.12</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.7</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.8</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>1254.45.12.9</keycode>
	</row>

	<row>
		<level>40</level>
		<keycode>99.25.6</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>99.25.6.45</keycode>
	</row>
	<row>
		<level>50</level>
		<keycode>99.25.6.46</keycode>
	</row>
</data>

What could be the XPath expression to get the maximum number of nodes of
level=50 in data those keycode starts like the level=40 line ?
Here the answer would be 3 as the maximum number of level = 50 nodes for
a given level = 40 is 3

The following outputs "3" for your sample:


<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  version="2.0">

  <xsl:param name="l1" select="'50'"/>
  <xsl:param name="l2" select="'40'"/>

<xsl:key name="k1" match="row" use="level"/>

<xsl:template match="/">
<xsl:variable name="groups" as="element(group)*">
<xsl:for-each select="key('k1', $l2)">
<group>
<xsl:copy-of select="key('k1', $l1)[starts-with(keycode, current()/keycode)]"/>
</group>
</xsl:for-each>
</xsl:variable>
<xsl:value-of select="max($groups/count(row))"/>
</xsl:template>


</xsl:stylesheet>

--

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/

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