Re: [xsl] Best Way to Select Following Elements With An Ancestor?

[David Carlisle <davidc@xxxxxxxxx>]

On 22/03/2014 12:46, Eliot Kimber wrote

:
> I have a document where each child of the root element establishes a
> unique content with regard to the output result (in this case,
> corresponding to InDesign frames).
>
> For a given descendant of one of these elements I need to know if there
> are any following elements within the same context. So simply doing
> following::* won't work and the following elements I'm checking for need
> not be siblings of the current element.
>
> The solution I arrived at is:
>
> <xsl:variable name="myDitaAncestor" select="ancestor::dita"
> as="element()*"/>
>
>      <xsl:variable name="followingWithinDita" as="element()*"
>    select="following::*[count(ancestor::dita | $myDitaAncestor) = 1]"
>      />
>
> This works but I'm wondering if there's a better solution, either one that
> is more efficient or one that is more elegant?



well if you know there's a dita acestor,

count(ancestor::dita | $myDitaAncestor) = 1

can be written

ancestor::dita is $myDitaAncestor


you could also do

following::* union $myDitaAncestor//*

but I'd guess that's less efficient.

Something tells me you should be using a key, but keying the dita 
elements on all its descendents sounds a bit expensive.