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Re: Drafting definitions for select expressions

From: Andy Seaborne <andy.seaborne@talis.com>
Date: Tue, 08 Dec 2009 14:37:33 +0000
Message-ID: <4B1E64AD.9080503@talis.com>
To: SPARQL Working Group <public-rdf-dawg@w3.org>


On 08/12/2009 12:50, Axel Polleres wrote:
> p.s.:
>   just two questions which I don't really get yet in the proposal on [1] yet, before I forget...
>
> 1) Does this mapping cover left-to-right evaluation as in [2], is it intended to?

Yes.

> 2) I understand that the case discusseed in [3] is forbidden by this definition, yes?

Yes - see the algebra translation:

"""
variable must not appear in VS; if it does then generate a syntax error 
and stop
"""
and explaination text:
"""
The syntax error arises for use of a variable in as the target of AS 
(e.g. ... AS ?x) when the variable is used inside the WHERE clause of 
the SELECT.
"""


>
> Hear you in two hours...
>
> thanks,
> Axel
>
> 1. http://www.w3.org/2009/sparql/docs/query-1.1/select-expr-defs-1-1.html
> 2. http://lists.w3.org/Archives/Public/public-rdf-dawg/2009OctDec/0418.html
> 3. http://lists.w3.org/Archives/Public/public-rdf-dawg/2009OctDec/0425.html
>

	Andy
Received on Tuesday, 8 December 2009 14:37:49 GMT

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