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Re: Action-48 text: a New Plan for plain literals

From: Antoine Zimmermann <antoine.zimmermann@insa-lyon.fr>
Date: Mon, 23 May 2011 15:02:35 +0200
Message-ID: <4DDA5AEB.10009@insa-lyon.fr>
To: public-rdf-wg@w3.org
Good. I tried to stretch this proposal in every direction to see if it's 
causing troubles to other specs but I couldn't. Pretty well formulated.

I have a remark though: by imposing that all concrete syntaxes have 
syntactic sugar for xs:string-typed literals, we make xs:string a 
special datatype which becomes an integral part of RDF. This was not the 
case before. In RDF 2004, XSDs were merely mentioned as a possible 
example of datatype map, nothing more. "foo"^^xs:string had no specific 
meaning under the RDF-semantics, nor under the RDFS-semantics nor even 
under the D-semantics when D does not map xs:string to the corresponding 
XML Schema datatype.

I am happy that xs:string be tightly integrated in RDF. However, I think 
we could go one step further by making XSDs---at least the ones 
mentioned in Sect.5.1 of RDF Semantics---an integral part of RDF.  This 
means that there should be an entailment regime that includes the XSD 
semantics at a "low level" (maybe at the level of RDF-entailment), 
rather than as an extension of RDFS-entailment.  This would also mean 
that XSDs should be presented in RDF Concept, rather than loosely 

In the current spec, there is no restrictions on datatype maps, such 
that one can define a D-entailment where the URI "xs:string" is mapped 
to numbers or dates or whatever. Considering the importance of XSDs, we 
could impose a stricter relationship between the xsd: URIs and the XML 
Schema datatypes.


Le 23/05/2011 05:01, Pat Hayes a écrit :
> The proposal outlined in the wiki here
> http://www.w3.org/2011/rdf-wg/wiki/StringLiterals/LanguageTaggedLiteralDatatypeProposal
> completes Richard and my action item 48 from the last telecon.
> Pat
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Antoine Zimmermann
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Database Group
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Received on Monday, 23 May 2011 13:03:04 UTC

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