RE: xslt 2 grouping - solution and result: xsl-fo prop

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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