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RE: XQuery Puzzle

• From: "Michael Kay" <mike@s...>
• To: "'Fraser Goffin'" <goffinf@g...>,"'xml-dev'" <xml-dev@l...>
• Date: Thu, 17 Apr 2008 18:31:08 +0100

> 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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• Follow-Ups:
  • Re: XQuery Puzzle
    • From: "Fraser Goffin" <goffinf@g...>

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