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Re: Review: SPARQL 1.1 Federated Extensions

From: Carlos Buil Aranda <cbuil@fi.upm.es>
Date: Mon, 28 Feb 2011 19:31:16 -0300
Message-ID: <4D6C2234.70007@fi.upm.es>
To: Lee Feigenbaum <lee@thefigtrees.net>
CC: SPARQL Working Group <public-rdf-dawg@w3.org>, Axel Polleres <axel.polleres@deri.org>
  Hi all,

I have a question regarding your comments about sections 4.1 Definition 
of Service and 4.3 Service evaluation semantics (now sections 3.1 and 
3.2). In section 3.1 the evaluation of SERVICE is defined using an 
algorithm meanwhile in section 3.2 I use an algebraic expression. 
Section 3.1 received several comments from you both (Axel and Lee) and 
section 3.2 none. Both sections describe the same, the service 
semantics. I'd prefer to remove section 3.1 and leave only section 3.2 
for describing SERVICE semantics. For me it contains a clearer and 
cleaner definition. The only thing missing is the silent op function, 
but I would add it in the next days. I need to think a little bit about 
it. Also, a bit more textual explanation would be needed.

any comment?


>
> * 4.1 I don't think this should restate the text from SPARQL 1.1 
> Query. It should only include the new additions to the algorithm, 
> along with a clear reference to where the new bit is inserted.
>
> * 4.1 This doesn't seem to take SILENT into consideration.
>
> * 4.1 The algebra expression given for an example seems to be 
> completely incorrect. Can this be checked?
>
> * 4.1. I think the definition is unclear as written. Specific 
> questions I have are:
>   * What is "B"?
>   * What does "if IRI is a SPARQL service" mean?
>   * What is omega?
>
> * Remove 4.2.
>
> * I'm unclear as to how 4.1 relates to 4.3?
>
> * Remove 4.4
>
> * 4.5 needs to be explained in the context of 4.1 and 4.3.
>
> * The conformance section needs to be tuned specifically to federated 
> query.
>
>
> Lee
>
>
Received on Monday, 28 February 2011 22:32:22 GMT

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