Bugs item #1637554, was opened at 2007-01-17 11:36
Message generated for change (Comment added) made by mvankeulen
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Category: PF general
Group: Pathfinder CVS Head
Status: Closed
Resolution: Invalid
Priority: 6
Private: No
Submitted By: Maurice van Keulen (mvankeulen)
Assigned to: Nobody/Anonymous (nobody)
Summary: Duplicates in sequence lookup
Initial Comment:
(milprint_summer version on Suse 9)
The query below selects the first and third element from the sequence $all. On
each iteration of $i, $all[$i] returns all four elements of $all instead of
only one. If you replace the $num2 in the for with $num2, the result is correct.
<res>{
let $all:=(<a/>,<b/>,<c/>,<d/>)
,$nums1:=(1,3)
,$nums:=<nums><num i="1"/><num i="3"/></nums>
,$nums2:=$nums/num/@i
for $i in $nums2
return <elem num="{$i}">{$all[$i]}</elem>
}</res>
Intended result:
<res>
<elem num="1">
<a/>
</elem>
<elem num="3">
<c/>
</elem>
</res>
Computed result:
<res>
<elem num="1">
<a/>
<b/>
<c/>
<d/>
</elem>
<elem num="3">
<a/>
<b/>
<c/>
<d/>
</elem>
</res>
----------------------------------------------------------------------
>Comment By: Maurice van Keulen (mvankeulen)
Date: 2007-01-17 14:09
Message:
Logged In: YES
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Originator: YES
Hmmm ... I should have noticed this. This behaviour of predicates is
awkward. Even "$all[data($i)]" does not work (apparently the effective
Boolean value of a string is also true). Only "$all[$i cast as
xs:integer]" seems to work. Any other (nicer) way to retrieve the integer
value of an attribute?
----------------------------------------------------------------------
Comment By: Torsten Grust (teggy)
Date: 2007-01-17 11:51
Message:
Logged In: YES
user_id=642632
Originator: NO
Your result is correct in both cases. Note that $num2 is bound to a
sequence of two *attribute nodes*, not to two xs:integer values.
As a result, in the for-loop $i will be bound to a node and the effective
Boolean value of $i will be 'true'. That's why $all[$i] returns all nodes
in the $all sequence.
Cheers,
--Teggy
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