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RE: positional predicates in XPath vs XQL
- From: "Howard Katz" <howardk at fatdog dot com>
- To: <xsl-list at lists dot mulberrytech dot com>
- Date: Sat, 24 Nov 2001 03:35:03 -0800
- Subject: RE: [xsl] positional predicates in XPath vs XQL
- Reply-to: xsl-list at lists dot mulberrytech dot com
> 1 section
> 2 para
> 3 para
> 4 section
> 5 para
> 6 section
> 7 para
> 8 para
> 9 para
>
> [Note that this is not a well-formed XML document, though XPath
> can work on well-formed text entities such as this.]
Right.
> The XPath is equivalent to the expanded syntax
> /child::section/child::para[position()=1]. The first / selects the root
> node. The next expression selects all <section> children of the root -
> nodes 1, 4, and 6 in your example. The next expression, child::para,
> selects nodes for each node in its context. For node 1, nodes 2
> and 3 are selected; for node 4, node 5 is selected; for node 6, nodes 7,
8,
> and 9 are selected. For each node set, the predicate is evaluated,
> returning true for nodes 2, 5, and 7, as they are each the first in their
node set.
Ah, that was what I needed. I had just spent 1/2 hour trying the parse the
English in the section of the XPath specification on predicates and had
obviously failed miserably. Your example makes it much clearer.
Thanks,
Howard
> ~Chris
>
> P.S. YM "ratiocination". HTH. HAND.
Huh?
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