[xquery-talk] Find All Nodes Between Root Node and Descendant Nodes of Some Type

[Eliot Kimber]

That seems to easy Ken.

In terms of processing optimization, is there any reason to prefer one
formulation over the other (meaning, is it possible to predict how XPath
processors will be able to optimize this type of expression)?

Thanks,

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




On 7/19/15, 10:09 AM, "G. Ken Holman" <talk-bounces at x-query.com on behalf
of gkholman at cranesoftwrights.com> wrote:

>How about:
>
>   $a1//b except $a1//a//b
>
>. . . . . .  Ken
>
>At 2015-07-19 06:33 -0500, Eliot Kimber wrote:
>>Given this starting document:
>>
>>Let $doc :=
>><root>
>><a id="a1">
>>   <b>b1</b>
>>   <b>b2</b>
>>   <c>
>>     <b>b6</b>
>>   </c>
>>   <a id="a2">
>>     <b>b3</b>
>>     <b>b4</b>
>>     <a id="a3">
>>       <b>b5</b>
>>     </a>
>>   </a>
>>  </a>
>>  </root>
>>
>>I want to find all the <b> elements descending from <a id="a1"> but not
>>within nested <a> elements:
>>
>><b>b1</b>
>>     <b>b2</b>
>>     <b>b6</b>
>>
>>
>>This gives me the correct answer:
>>
>>
>>let $a1 := $doc/a
>>let $bsInA1 := $a1//b[not(./ancestor::a = ($a1//a))]
>>
>>
>>My question: With Xpath 3.1, is there a better way to express this query?
>>I looked at the new outermost() and innermost() operators but I didn't
>>see
>>a way to apply them to this problem.
>>
>>Thanks,
>>
>>Eliot
>>
>>----
>>Eliot Kimber, Owner
>>Contrext, LLC
>>http://contrext.com
>>
>>
>>
>>_______________________________________________
>>talk at x-query.com
>>http://x-query.com/mailman/listinfo/talk
>
>
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