[xsl] Re: Selecting a node set

[Dimitre Novatchev <dnovatchev at yahoo dot com>]

Tony Click wrote:

> My problem is I need to identify a current node based on the subsequent
> node.  The following code gives me a true for each node that I want to keep
> and a false for the ones I don't want.  Unfortunatly, I need it in the form
> of a select.
> 
> 	<xsl:for-each select="endTime">
> 		<xsl:value-of select="count(
> following-sibling::endTime[1]/interval[@channelDetailId =
> current()/interval/@channelDetailId] ) != count( current()/interval ) "> 
> 	</xsl:for-each>
> 
> As soon as I try something like:
> 
> 	<xsl:value-of select="endTime[ count(
> following-sibling::endTime[1]/interval[@channelDetailId =
> current()/interval/@channelDetailId] ) != count( current()/interval ) ]"/>
> 
> That of course doesn't work ( I believe that is beacuse current() doesn't
> actually behave the same as it does in the for loop).  
> 

The information you're giving us is insufficient. In general I think the answer
should be that you cannot have a single XPath expression for the above without also
including in it some variable references.

In any specific case the answer may be different.

For example, if it is the case that a "channelDetailId" attribute value uniquely
identifies an "interval" element, then the following XPath expression will yield the
desired result:

endTime[interval/@channelDetailId 
     !=  
       following-sibling::endTime[1]/interval/@channelDetailId
       ]


This will be even simpler if we knew that an "endTime" has only one "interval"

Cheers,
Dimitre Novatchev.


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