Subject: RE: Count of previous nodes until a child node of a previous node is found with certain attribute value
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Sat, 26 May 2007 21:48:25 +0100
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David's solution is probably the best that can be done in 1.0.
I've often felt the need for a higher-order "until" operator:
$sequence until condition
which selects all the nodes in $sequence up to [perhaps including] the first
one where condition is true.
In 2.0, you can do this as:
subsequence($sequence, 1, index-of($sequence/condition, true())[1]])
or in your case, since you only want the number of elements
index-of(preceding-sibling::p/(component/@name='newpage'), true())[1]
This has a better chance than David's solution of evaluating the
preceding-sibling axis only as far as the first qualifying node.
Michael Kay
http://www.saxonica.com/
> -----Original Message-----
> From: Jeremy Freedman [mailto:jeremy.freedman@xxxxxxxxx]
> Sent: 26 May 2007 20:22
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Count of previous nodes until a child node of
> a previous node is found with certain attribute value
>
> Hi all,
>
> I'm the first to admit I'm not XSL expert, but I've been
> stuck on this one for hours and I'm hoping someone can help me out.
>
> I've found similar posts where a user is looking for a count
> of following nodes until an attribute is found, but not close
> enough to what I'm looking to do.
>
> Assuming we have this XML structure:
>
> <body>
> <p>
> text
> </p>
> <p>
> text2
> </p>
> <p>
> <component name="newpage" />
> </p>
> <p>
> text3
> </p>
> <p>
> text4
> </p>
> <p>
> text5
> </p>
> <p>
> text6
> </p>
> <p>
> <component name="newpage" />
> </p>
> <p>
> text7
> </p>
> <p>
> text8
> </p>
> <p>
> text9
> </p>
> </body>
>
>
> I want to be able to find the count of preceding "p" nodes
> from the p node I am on, up until I find a "p" node with a
> child node named "component" with attribute name=newpage.
>
> Examples:
>
> If I am on the p node whose value is "text8", I should get a count of
> 1 because there is only 1 previous p node before I find a p
> node with the component node with attribute name=newpage.
>
> p node value Count
> text 0
> text2 1
> text3 0
> text4 1
> text5 2
> text6 3
> text7 0
> text8 1
> text9 2
>
>
> You will be my personal hero is you can help me out!
>
> Much thanks,
>
> Jeremy
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