Re: [Exist-open] Need help in understanding eXist Xquery results : eXist version

[Jason S. <js...@in...>]

Benoit, eXist is long overdue for a 1.4.1 bugfix release.  The /stable/eXist-1.4.1 branch seems to be - no surprise - stable.  And it has lots (10 months worth) of fixes.  

Are you able to build the code, or are you committed to the 1.4.0 release?

-----Original Message-----
From: Benoit Mercier [mailto:Benoit.Mercier@USherbrooke.ca] 
Sent: Thursday, September 02, 2010 12:09 PM
To: exi...@li...
Subject: [Exist-open] Need help in understanding eXist Xquery results : eXist version

Hi,

I forgot to mention that I am using eXist 1.4.0-rev10438-20091111

Benoit


*******************
I found a strange behaviour in XQuery evaluation by eXist.  I cannot explain the difference between the results obtained via XQuery 1 and Xquery 2.


Xquery 1
--------
let $xml :=
<test_document>
      <title>Is there a bug?</title>
      <metas>
          <meta>
              <name>error</name>
              <value>Should NOT return.</value>
          </meta>
          <meta>
              <name>correct</name>
              <value>Should return.</value>
          </meta>
      </metas>
</test_document>

return
$xml//title[ends-with(.,"bug?")]/ancestor::test_document/metas//name[contains(.,"correct")]

XQuery 1 result
---------------
<name>correct</name>

If you create an XML document (let's say "/db/tmp/test_document.xml") with the content of the $xml variable and execute the following XQuery, you get wrong results.  But I might miss something...


Xquery 2
--------
document("home/benoitm/test_document.xml")//title[ends-with(.,"bug?")]/ancestor::test_document/metas//name[contains(.,"correct")]


XQuery 2 results
----------------
<name>error</name>
<name>correct</name>


To get correct results with XQuery 2, you have to add parenthesis like this :

(
document("home/benoitm/test_document.xml")//title[ends-with(.,"bug?")]/ancestor::test_document/metas//name 
    )   [contains(.,"correct")]

It seems that the parent of the last predicate is wrong when evaluating without parenthesis.

Am I misunderstanding something?

Thank you in advance!

Benoit (mercibe)