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Re: What does this XPath expression mean ?

From: Martin Honnen <mahotrash@-----.-->
To: NULL
Date: 3/18/2008 12:42:00 PM


zw wrote:
> Can anyone interpret this ?
> select="/Results/*[not(@label = preceding::*/@label)]

It selects the child elements of the root element 'Result' for which 
there is no preceding element with the same value for the 'label' 
attribute. So it selects the child elements with a distinct 'label' 
attribute value, for example if we have

<Results>
   <foo label="a">1</foo>
   <foo label="b">2</foo>
   <foo label="a">3</foo>
   <foo label="c">4</foo>
   <foo label="b">5</foo>
</Results>

then the following stylesheet

<xsl:stylesheet
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   version="1.0">

   <xsl:output method="text"/>
   <xsl:template match="/">
     <xsl:for-each select="/Results/*[not(@label = preceding::*/@label)]">
       <xsl:value-of select="concat(., '&#10;')"/>
     </xsl:for-each>
   </xsl:template>
</xsl:stylesheet>

outputs

1
2
4


-- 

	Martin Honnen --- MVP XML
	http://JavaScript.FAQTs.com/

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