Re: [xml-dev] XQuery Puzzle

["Fraser Goffin" <goffinf@googlemail.com>]

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@saxonica.com> 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@saxonica.com> 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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