On Sat, Mar 22, 2014 at 1:46 PM, Eliot Kimber <ekimber(_at_)contrext(_dot_)com>
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.
I may be thinking about this the wrong way, but it seems like the
situation you describe (some following element exists that is a
descendant of the same context-setting node) is equivalent to saying
"Either this node has a following-sibling, or some ancestor of it has
a following-sibling, not counting the context-setting nodes."
Is the above accurate?
If the above understanding is correct, then a more elegant answer
would be to use recursive functions:
Define a recursive function that uses the following logic:
f($x) = false if $x is one of the context nodes (/child::element())
f($x) = true if $x has any following::sibling elements.
f($x) = f($x/..) if neither of the above statements resolves the answer.
Or, without recursive functions:
Define a variable containing the context-setting nodes:
$context_nodes = /child::element()
Then the predicate you want is:
boolean(ancestor-or-self::element()[not($context_nodes)]/following-sibling::element()
-David
--
"A false conclusion, once arrived at and widely accepted is not
dislodged easily, and the less it is understood, the more tenaciously
it is held." - Cantor's Law of Preservation of Ignorance.
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