Re: XPath - How to select preceding nodes that are de

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Subject: Re: XPath - How to select preceding nodes that are descendants of specific ancestor?
From: Mike Trotman <mike.trotman@xxxxxxxxxxxxx>
Date: Sat, 26 Jun 2004 15:40:07 +0100

Thanks Ken.

I've given your example a quick test - and it does seem to be efficient - and better than my current interim solution:

<xsl:variable name='curridx' select='generate-id(descendant-or-self::LEAF[1])'/> <xsl:variable name='leafset' select='ancestor::SUBTREE//LEAF'/> <xsl:variable name='num_prev_leafs'> <xsl:for-each select='$leafset'> <xsl:if test='$curridx = generate-id(.)'><xsl:value-of select='position() - 1'/></xsl:if> </xsl:for-each> </xsl:variable>

I hadn't thought of using the <xsl:number> element in a variable definition before. Probably because I cannot get a clear picture in my head of how <xsl:number> works. I will investigate further.

However I now find I do need to know the number of previous LEAF nodes at other points in the SUBTREE hierarchy - when - as you point out - the number function will miss by one (? or more?). Is there a modification to the <xsl:number> approach you can suggest (as this seems a lot more elegant than my current attempt) that would work from non-LEAF elements?

G. Ken Holman wrote:

At 2004-06-26 12:19 +0100, Mike Trotman wrote:

I have an XML document with multiple subtrees starting at element
'SUBTREE' containing 'LEAF' leaf element descendants at various
hierarchical depths.
I need to know - for each 'LEAF' element - how many preceding 'LEAF'
elements there are within the closest ancestor 'SUBTREE'.

I would treat it like figure numbering in a book, where the figures can be anywhere in preceding subtrees, and let the processor do the counting for you:

 <xsl:variable name="count-temp">
   <xsl:number count="LEAF" from="SUBTREE" level="any"/>
 </xsl:variable>
 <xsl:variable name="count" select="number($count-temp) - 1"/>

This won't be negative because you said you would be counting from a LEAF.

I hope this helps.

.................. Ken

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Current Thread
XPath - How to select preceding nodes that are descendants of specific ancestor? Mike Trotman - Sat, 26 Jun 2004 12:19:16 +0100 G. Ken Holman - Sat, 26 Jun 2004 08:58:02 -0400 Mike Trotman - Sat, 26 Jun 2004 15:40:07 +0100 <= Mike Trotman - Sat, 26 Jun 2004 15:58:35 +0100

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