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Re: DM and R2RML should use same datatype mapping

From: Alexandre Bertails <bertails@w3.org>
Date: Thu, 27 Oct 2011 09:11:56 -0400
Message-ID: <4EA9589C.9090005@w3.org>
To: Richard Cyganiak <richard@cyganiak.de>
CC: public-rdb2rdf-comments@w3.org, Eric Prud'hommeaux <eric@w3.org>
On 10/27/2011 06:27 AM, Richard Cyganiak wrote:
> This is a Last Call comment on the Direct Mapping and R2RML specifications:
>
> http://www.w3.org/TR/2011/WD-rdb-direct-mapping-20110324/

http://www.w3.org/TR/2011/WD-rdb-direct-mapping-20110920/

> http://www.w3.org/TR/2011/WD-r2rml-20110920/
>
>
> Both specifications define a mapping from SQL datatyped values to RDF literals.
>
> http://www.w3.org/TR/2011/WD-rdb-direct-mapping-20110920/#defn-literal_map
> http://www.w3.org/TR/2011/WD-r2rml-20110920/#datatype-conversions
>
> The two mappings differ in various details. Given that the requirements for both mappings are the same, this places undue burden on implementers that plan to implement both the Direct Mapping and R2RML.
>
> Therefore, both specifications should use the same mapping.

Silly question: do we expect the informative descriptions to say 
something about the datatype mappings?

Alexandre.


>
> I note that the mapping in R2RML is based on the SQL-to-XML mapping in ISO/IEC 9075-14:2008, and covers more of SQL 2008 than the mapping in the DM.
>
> I therefore propose that the mapping from the R2RML specification is used in both documents, with the DM specification using a normative reference to the R2RML spec.
>
> Best,
> Richard
>
Received on Thursday, 27 October 2011 13:12:06 GMT

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