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Re: Xpath3 method for concisely getting position of r

Subject: Re: Xpath3 method for concisely getting position of ranging variable in FOR expression?
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Fri, 14 Mar 2014 16:16:52 +0000
Re:  Xpath3 method for concisely getting position of  r
In many cases "for" expressions can now be written with the "!" operator, and
in this case you can use position().

For example

for $i in 1 to count($seq)) return $i * seq[$i]

can now be written as

$seq ! (. * position())

Michael Kay
Saxonica

On 14 Mar 2014, at 15:53, David Rudel <fwqhgads@xxxxxxxxx> wrote:

> In Xpath2, there was no super-concise method of extracting the
> position of a ranging variable in a for expression.
>
> For example, in the expression "for $i in $seq return [expression]",
> you could not use $i/position() to give you the position of $i.
>
> Instead you had to rewrite as "for $n in 1 to count($seq)"... and then
> use $n or $seq[$n] as needed.
>
> I'm writing to ask whether there is any new method in Xpath3 that
> provides a more concise method of referencing the position of a bound
> range variable.
>
> -David
>
> --
>
> "A false conclusion, once arrived at and widely accepted is not
> dislodged easily, and the less it is understood, the more tenaciously
> it is held." - Cantor's Law of Preservation of Ignorance.

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