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Re: A review of rdf:text from a SPARQL perspective (1st draft)

From: Steve Harris <steve.harris@garlik.com>
Date: Tue, 28 Apr 2009 10:51:37 +0100
Message-Id: <402F8A3F-1CB4-42B5-844A-62E8F94B9323@garlik.com>
To: SPARQL Working Group <public-rdf-dawg@w3.org>
Sorry, I originally sent this to Andy directly, rather than to the  
list, by mistake. It comprises my comments on the rdf:text document.

On 22 Apr 2009, at 17:20, Seaborne, Andy wrote:
>
> == Overview
>
> There are some SPARQL-specific issues that arise that are not  
> addressed in the document.  The rdf:text only refers to "graph  
> exchange" when saying that rdf:text must not appear in RDF graphs  
> serializations but that does not apply to SPARQL directly.
>
> Because rdf:text document says nothing about SPARQL operations and  
> it's not clear to me whether changes to existing SPARQL queries are  
> being assumed.  At one time, they were.

My reading of section 4 is that it would change SPARQL query results  
for processors that implement rdf:text, and not for ones that don't.  
That seems like a barrier to interoperability.

> Note: In RDF, a literal has either a language tag or a datatype but  
> not both. rdf:text changes this assumption so deployed code or  
> SPARQL implementations that rely on this invariant may break.

That is a big concern for me, and would cause significant back- 
compatibility issues.

- Steve

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Steve Harris
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Received on Tuesday, 28 April 2009 09:52:12 GMT

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