[xquery-talk] XQuery and id()/idref(); Controlling the children of
nodes in the result sequence
Maik Stührenberg
maik.stuehrenberg at uni-bielefeld.de
Thu Apr 24 15:57:52 PDT 2008
Well, if someone of you could be so kind and help me brighten up my mind...
As I only want to output children of a node with a the same value of the
a:span attribute as the a:span/@xml:id, I tried the following query:
declare namespace a="http://www.example.org/a";
declare namespace b="http://www.example.org/b";
declare namespace c="http://www.example.org/c";
<resultset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.example.org/a"
xmlns:a="http://www.example.org/a" xmlns:b="http://www.example.org/b"
xmlns:c="http://www.example.org/c">
{
let $d := doc('demo_instance.xml')
for $s in $d/a:collection/a:entry/a:spans/a:span
return
<result span="{$s/@xml:id}" start="{$s/@start}" end="{$s/@end}">
{
let $e := $d/a:collection/a:entry/a:data//*[@a:span = $s/@xml:id]
return
$e[not(child::element()[@a:span = $s/@xml:id])]
}
</result>
}
</resultset>
What I don't get is why the c:word elements are still included in the
output? They don't share the same value with their parent node...
<resultset xmlns:c="http://www.example.org/c"
xmlns:b="http://www.example.org/b"
xmlns:a="http://www.example.org/a"
xmlns="http://www.example.org/a"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<result start="0" end="40" span="seg1">
<b:para a:span="seg1"/>
</result>
<result start="0" end="20" span="seg2">
<c:sentence id="w35" a:span="seg2">
<c:word a:span="to1" id="w36"/>
<c:word a:span="to2" id="w37"/>
<!-- ... -->
</c:sentence>
</result>
<result start="0" end="4" span="to1">
<c:word a:span="to1" id="w36"/>
</result>
<result start="5" end="8" span="to2">
<c:word a:span="to2" id="w37"/>
</result>
</resultset>
Sorry for asking over and over again, but I would really love to solve
this one -- or get a definite answer that it is not possible in XQuery.
Best regards,
Maik Stührenberg
Michael Kay schrieb:
>> if you rewrote
>>
>> not(ancestor::* intersect $e)
>>
>> to be
>>
>> not(some $x in ancestor::* satisfies $x is $e)
>>
>> ...would that potentially stop searching when it found a
>> match? Or would that generate the same code as the top version?
>
> They're likely to be pretty much equivalent in Saxon.
>
> .//*[pred]
>
> will find all the descendant elements and test them against the predicate,
> there are no rewrites that recognize that particular predicates might enable
> the search scope to be reduced, other than the indexing optimisations in
> Saxon-SA which handle predicates such as [relativePath=value].
>
> Michael Kay
> http://www.saxonica.com/
>
>
--
Maik Stührenberg, M.A.
Universität Bielefeld
Fakultät für Linguistik und Literaturwissenschaft
Universitätsstraße 25
33615 Bielefeld
Telefon: +49 (0)521/106-2534
E-Mail: maik.stuehrenberg at uni-bielefeld.de
http://www.maik-stuehrenberg.de
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