This is the mail archive of the
xsl-list@mulberrytech.com
mailing list .
Re: Problem using preceding-sibling
- From: Jeni Tennison <jeni at jenitennison dot com>
- To: "Faroukh Fekravar" <fekravar at austin dot apc dot slb dot com>
- Cc: xsl-list at lists dot mulberrytech dot com
- Date: Tue, 14 May 2002 16:15:57 +0100
- Subject: Re: [xsl] Problem using preceding-sibling
- Organization: Jeni Tennison Consulting Ltd
- References: <001801c1fb55$dbfeb7e0$9d47b9a3@austin.apc.slb.com>
- Reply-to: xsl-list at lists dot mulberrytech dot com
Hi Faroukh,
> I try to get the immediate sibling by checking the position, however
> I get always the first node.
>
> <xsl:variable name="cpo" select="position()"/>
> <xsl:element name="Preceding_GID">
> <xsl:value-of select="generate-id(preceding-sibling::node()[position()=
> $cpo - 1])"/>
> </xsl:element>
You're a bit confused about the interaction between axes and the
position() function. The position() function gives you the position of
the context node amongst the other nodes you're looking at. If you did:
child::Level2[position() = 1]
or the equivalent:
Level2[1]
then you'd get the first Level1 child of the context node. If you did:
descendant::Level2[5]
then you'd get the fifth Level2 descendant of the context node. If you
did:
following-sibling::Level2[2]
then you'd get the second following sibling of the context node.
Similarly, if you did:
preceding-sibling::node()[1]
then you get the immediately preceding sibling of the node
(preceding-sibling is a reverse axis, which means that positional
predicates, like the one hear, count in reverse document order, so you
get the nearest sibling node).
What you need, then, is simply:
<Preceding_GID>
<xsl:value-of select="generate-id(preceding-sibling::node()[1])"/>
</Preceding_GID>
Although you could use:
<Preceding_GID>
<xsl:value-of select="generate-id(../node()[position() = $cpo - 1])"/>
</Preceding_GID>
if you really wanted (it's likely to be a lot less efficient).
Note that there's no need to use xsl:element to create your elements
if you know what their names are.
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list