RE: Last tango in Paris

[Dietrich A. <die...@ga...>]

Nigel, is multiple predicates implemented?

ie: //node-test[myPredicate1][myPredicate2]

if it's not, it would explain the "too many brackets" error.

Peter, assuming that you actually have a tango element that contains the attribute "place" with a value of "paris" *and* all the
"paris" nodes contain the same immediate parent, then the original xpath expression is correct and should only return 1 node:

//tango[@place="paris"][last()]

But if you have "paris" nodes that have *different* parents, then you may receive multiple nodes, as each my be the last child of
the respective context node. From the spec, section 2.5 Abbreviated Syntax:

"para[last()] selects the last para child of the context node"

- d.

> -----Original Message-----
> From: php...@li...
> [mailto:php...@li...]On Behalf Of Nigel
> Swinson
> Sent: Wednesday, February 20, 2002 3:59 PM
> To: php...@li...
> Subject: Re: Last tango in Paris
>
>
> > If I have a lot of tango nodes with a place attribute, and I want to find
> the
> > 5th tango in Paris, according to the Xpath definition, I should be able to
> do:
> >
> > tango[@place="Paris"][5]
> >
> > similarly, if I want to find the last tango in Paris, I should be able to
> do:
> >
> > tango[@place="Paris"][last()]
> >
> > However, I've tried numerous variations on this in the usecases testbench
> and
> > can't get it to work - it either finds nothing or tells me there's an
> invalid
> > number of brackets. I can find all the tangos in Paris, and the last
> tango,
> > but not the two together. Is this a bug, something not handled (yet?), or
> is
> > there some other notation I can use? (ok, I know I can fetch all the
> tangos
> > in Paris and then use PHP to get the last in the array.)
>
> I wonder if this is related to the fact that //*[last()] returns multiple
> nodes instead of one?
>
> I tried:
>
>      //employee[(@gender='m') and (position() = last())]
>
> against:
>
>     company-structure.xml
>
> at:
>
> http://www.carrubbers.org/scripts/php/xpath/testBench/useCases/index.php
>
> And it returns:
>
>     [0] => /company[1]/department[1]/employee[2]
>     [1] => /company[1]/department[2]/employee[2]
>     [2] => /company[1]/department[4]/employee[2]
>     [3] => /company[1]/department[5]/employee[2]
>
> Where:
>
>      //employee[(@gender='m')]
>
> Returns:
>
>     [0] => /company[1]/department[1]/employee[1]
>     [1] => /company[1]/department[1]/employee[2]
>     [2] => /company[1]/department[2]/employee[1]
>     [3] => /company[1]/department[2]/employee[2]
>     [4] => /company[1]/department[3]/employee[1]
>     [5] => /company[1]/department[4]/employee[1]
>     [6] => /company[1]/department[4]/employee[2]
>     [7] => /company[1]/department[5]/employee[1]
>     [8] => /company[1]/department[5]/employee[2]
>
> Is that any use??
>
> Nigel
>
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