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Re: can subqueries be executed first in SPARQL?

From: james anderson <james@dydra.com>
Date: Fri, 17 Jun 2016 09:36:08 +0000
Message-ID: <010201555db7b581-42ee28b8-3a12-421d-a779-1c8262be62e2-000000@eu-west-1.amazonses.com>
To: public-sparql-dev@w3.org
good morning;

> On 2016-06-17, at 09:52, Axel Polleres <droxel@gmail.com> wrote:
> Hi all,
> interesting discussion...
> First, let me say that I find the claim that something is "broken" here exaggerated.

well, while perhaps not “broken” in the sense of “inherently or evidently not functioning”, both hernández &co and patel-schneider have provided examples sufficient to support the claim that the definition constitutes a severe discontinuity.

if instead of

> The definition of EXISTS is broken so bad in SPARQL that it should be replaced with a completely different mechanism.

the claim had been, 

> The definition of EXISTS breaks with several central principles of the SPARQL evaluation model, such as the bottom-up nature of SPARQL query evaluation and rules for variable scope, in such basic ways and with so little motivation and so little explanation, that it leads to non-interoperable implementations and should be replaced.

would that be acceptable?
while the second is perhaps less polemic, it and its consequences are just as severe.

best regards, from berlin,
james anderson | james@dydra.com | http://dydra.com
Received on Friday, 17 June 2016 09:36:38 UTC

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