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Re: XQuery Puzzle

• From: Jonathan Robie <jonathan.robie@r...>
• To: Fraser Goffin <goffinf@g...>
• Date: Thu, 17 Apr 2008 14:27:56 -0400

Did you get a different result, or did you just find that not all 
implementations support all of these axes (which would give you an error)?

Jonathan

Fraser Goffin wrote:
> Is there any difference in the way that XPath 1.0 and 2.0 evaluate
> multiple predicates like this (there was a different result between
> some of the XQuery processors used and it wasn't clear whether these
> implemented XPath 1.0 or 2.0) ?
>
> Fraser.
>
> On 17/04/2008, Michael Kay <mike@s...> wrote:
>   
>>> Thanks. Does Andrews point above still hold though, that is,
>>> gotcha and div1 nodes are NOT siblings since they don't share
>>> a common parent ??
>>>       
>> Yes, the expression was void on both counts - Andrew spotted one mistake, I
>> spotted another.
>>
>> Michael Kay
>> http://www.saxonica.com/
>>
>>     
>>> Fraser
>>>
>>> On 17/04/2008, Michael Kay <mike@s...> wrote:
>>>       
>>>>> Sorry for asking an XQuery question here, if there is a more
>>>>> appropriate forum please let me know.
>>>>>           
>>>> talk at x-query.com
>>>>
>>>>         
>>>>> Anyway, a question relating to this simple XQuery has been
>>>>> circulating on another group, but I am puzzled as to
>>>>>           
>>> whether using
>>>       
>>>>> // on a sequence is valid (see the return clause below).
>>>>>           
>>> I tried in
>>>       
>>>>> a couple of XQuery parsers (Saxon9 + the one built into
>>>>>           
>>> XML Spy) and
>>>       
>>>>> both return no results ??
>>>>>
>>>>> let $set := (
>>>>>     <div1>one   </div1>,
>>>>>     <div1 class="doc">two   </div1>,
>>>>>     <div1>three   </div1>,
>>>>>     <div1 class="doc">four </div1>,
>>>>>     <gotcha>START</gotcha>,
>>>>>     <div1>five   </div1>
>>>>> )
>>>>> return $set//gotcha/preceding-sibling::div1[@class="doc"][1]
>>>>>           
>>>> This is actually an XPath question. This path expands to
>>>>
>>>>
>>>>         
>>> $set/descendant-or-self::node()/child::gotcha/preceding-sibling::div1[
>>>       
>>>> @class
>>>> ="doc"][1]
>>>>
>>>> Now, one of the elements in $set is a gotcha element, but
>>>>         
>>> none of them
>>>       
>>>> has a child, or has a descendant with a child, named
>>>>         
>>> gotcha. Therefore
>>>       
>>>> the expression selects nothing.
>>>>
>>>> You want $set/self::gotcha/....
>>>>
>>>> Michael Kay
>>>> http://www.saxonica.com/
>>>>
>>>>
>>>>         
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>>     
>
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>   

• References:
  • XQuery Puzzle
    • From: "Fraser Goffin" <goffinf@g...>
  • RE: XQuery Puzzle
    • From: "Michael Kay" <mike@s...>
  • Re: XQuery Puzzle
    • From: "Fraser Goffin" <goffinf@g...>
  • RE: XQuery Puzzle
    • From: "Michael Kay" <mike@s...>
  • Re: XQuery Puzzle
    • From: "Fraser Goffin" <goffinf@g...>