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Re: [xsl] Does the count() function require access to the whole subtree?


Subject: Re: [xsl] Does the count() function require access to the whole subtree?
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Sun, 12 Jan 2014 15:35:58 -0800

Was it Einstein who said:

"You do not really understand something unless you can explain it to
your grandmother"

Can somebody explain streaming to their grandmother?

On Sun, Jan 12, 2014 at 1:11 PM, Andrew Welch <andrew.j.welch@xxxxxxxxx> wrote:
>> It's traversing the subtree rooted at $n that's not an inspection
>> operation; this requires access to the nodes under $n, so it would be
>> an absorption operation. So from context $n, count($n/some/path) is
>> not going to be streamable unless we allow it to "absorb" $n in doing
>> so -- not because of the count(), but because of the traversal.
>
> My reading of it so far suggests that count($n/some/path) would be
> "striding" and therefore streamable.
>
> It would only be "absorbing" if you materialised the contents of <path>.
>
>
>
> --
> Andrew Welch
> http://andrewjwelch.com
>



-- 
Cheers,
Dimitre Novatchev
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