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RE: xslt 2 grouping - solution and result: xsl-fo property list.
- From: DPawson at rnib dot org dot uk
- To: xsl-list at lists dot mulberrytech dot com
- Date: Mon, 15 Jul 2002 15:31:57 +0100
- Subject: RE: [xsl] xslt 2 grouping - solution and result: xsl-fo property list.
- Reply-to: xsl-list at lists dot mulberrytech dot com
Comments lower down.
Mike Kay wrote:
> <p>
> <el att='a'>x</el>
> <el att='b'>x</el>
> <el att='c'>x</el>
> <el att='d'>y</el>
> </p>
>
>
> <xsl:template match='p'>
> <xsl:for-each-group select="e1" group-by=".">
> <e1 name="{.}">
> <xsl:for-each-group select="current-group()" group-by="@att">
> <xsl:value-of select="concat(@att, ' ')"/>
> </xsl:for-each>
> </e1>
> </xsl:for-each>
> </xsl:template>
>
> > The inner grouping takes each of these 'sequences' (is
> that the right
> > word?)
> > and groups them by attribute value.
> > then outputs each these values.
>
> That's right. The first time round the outer loop, current-group()
> selects the three "x" element, the second time round, it
> selects the "y"
> element.
>
> The inner xsl:for-each-group could equally have been written:
>
> <xsl:for-each select="distinct-values(current-group()/@att)">
> since you
> only want to select the distinct values of the attribute, not
> the group
> of nodes associated with each distinct value.
Sorry Mike, that's a bit too subtle for me.
distinct-values
(from the wd) The distinct-values function takes a sequence of nodes or
values as input, and returns a sequence in which duplicates have been
removed by value.
So it picks up the 'sequence' of all att nodes in the current-group,
and removes duplicates?
So it would be
<xsl:for-each select="distinct-values(current-group()/@att)">
<xsl:value-of select="concat(., ' ')"/>
</xsl:for-each>
Is that a stable one (wd wise?) or one that you simply haven't got
round to implementing as yet? I think that makes even more sense (simpler to
understand?)
than the first solution.
Thanks again Mike.
Regards DaveP
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