Sibling Check in XSLT

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The code below iterates to each "jar" and checks if three elements before there was a "cup" element. Executing different commands depending on the case.

the article

The interesting part of the example is the

<xsl:when test="name(preceding-sibling::*[3]) = 'cup'">

Which checks the name of the element three positions before.

This is executed inside the for-each procedure that iterates through all the jar elements:

<xsl:for-each select="jar">

The example XML

<?xml version="1.0"?>
<document>
	<cup/>
	<cup/>
	<cup/>
	<jar/> 
	<cup/>
	<jar/> 
	<cup/>
	<cup/>
	<jar/> 
</document>

the XSLT code

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 
	<xsl:template match="document">
		<xsl:for-each select="jar">
			<xsl:choose>
				<xsl:when test="name(preceding-sibling::*[3]) = 'cup'">
 
				</xsl:when>
				<xsl:otherwise>
 
				</xsl:otherwise>
		</xsl:for-each>
	</xsl:template>
</xsl:stylesheet>

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