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

[Eliot Kimber <ekimber@xxxxxxxxxxxx>]

I was somehow unaware of the after (>>) operator. That does seem to
express exactly the test I need to make. (Note to self: find time to do a
careful reading of the XQuery and XPath 2.0 Functions and Operators spec.)

So I guess the question would be whether or not a particular XSLT
processor (e.g., Saxon in my case) would be more or less efficient using
the after operation or using keys?

Cheers,

Eliot
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Eliot Kimber, Owner
Contrext, LLC
http://contrext.com




On 3/22/14, 8:13 AM, "Andrew Welch" <andrew.j.welch@xxxxxxxxx> wrote:

>On 22 March 2014 12:46, Eliot Kimber <ekimber@xxxxxxxxxxxx> 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 | $myDitaAncestor) = 1]"
>>     />
>>
>> This works but I'm wondering if there's a better solution, either one
>>that
>> is more efficient or one that is more elegant?
>
>I don't know if it's more efficient or more elegant, but you could do:
>
>$myDitaAncestor//* >> current()
>
>Keying elements by their <dita> ancestor might help, eg
>
>key name="elems-by-dita" match="*" use="generate-id(ancestor::dita)"
>
>key('elems-by-dita', $dita-id) >> current()
>
>where $dita-id is the generate-id() of the dita ancestor passed down
>as a tunnelled param.
>
>--
>Andrew Welch
>http://andrewjwelch.com