Context node traversal inside predicates (was: Nodes a

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Subject: Context node traversal inside predicates (was: Nodes and Strings)
From: "Joris Gillis" <roac@xxxxxxxxxx>
Date: Tue, 26 Jul 2005 14:10:28 +0200

Hello group,

Tempore 22:47:47, die 07/25/2005 AD, hinc in xsl-list@xxxxxxxxxxxxxxxxxxxxxx scripsit Elaine Prata <Elaine.Prata@xxxxxxxxxxxxxx>:

<setA>
    <element>value1</element>
    <element>value2</element>
    <element>value3</element>
    <element>value4</element>
    <element>value5</element>
</setA>

<setB>
    <element>aStringBeforeValue.value1</element>
    <element>aStringBeforeValue.value2</element>
    <element>aStringBeforeValue.value3</element>
</setB>

expected result (for intersection between the sets):

<setC>
    <element>value1</element>
    <element>value2</element>
    <element>value3</element>
</setC>

This problem encouraged me to finally post about some lack of functionality I've always been experiencing in XPath1.0

I'd wish I could solve the problem above with an Xpath like this:

$SetA/Element[$setB/Element[substring-after(.,'.')=context(1)]]

The 'context()' function would be similar to the 'current()' fuction.
It would recall previous context nodes.

'context(n)' would recall the n-th context node (as found when propagating upwards in the predicates of the expression)

e.g.: 'context(0)' is equal to '.' 'context(1)' is equal to the context node as constructed by the immmediately outer predicate. ... 'context(-1)' would be equal to the context node as found in the outermost predicate.

Will this kind of functionality be available in Xpath 2 ? Or is it a proof of bad coding practices that one thinks he should be needing this?

please ask for more explanation if I did not stated this clear.

Thanks in advance for any reply...
--
Joris Gillis (http://users.telenet.be/root-jg/me.html)
"NN= N?N/N4N1 OON9 N?ON4N-N= N?N/N4N1"  - N#O	N:ON1ON7O

Current Thread
Nodes and Strings Elaine Prata - 25 Jul 2005 20:48:51 -0000 Aron Bock - 26 Jul 2005 02:56:10 -0000 andrew welch - 26 Jul 2005 08:05:24 -0000 Joris Gillis - 26 Jul 2005 08:20:41 -0000 Joris Gillis - 26 Jul 2005 12:09:55 -0000 <= David Carlisle - 26 Jul 2005 13:29:45 -0000 Michael Kay - 26 Jul 2005 13:36:10 -0000 <Possible follow-ups> Elaine Prata - 26 Jul 2005 11:51:47 -0000

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Re: Nodes and Strings, Joris Gillis	Thread	Re: Context node traversal in, David Carlisle
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