W3C home > Mailing lists > Public > public-rdb2rdf-wg@w3.org > April 2011

Re: Keeping R2RML free of Direct Mapping dependency (ISSUE-25)

From: Ivan Herman <ivan@w3.org>
Date: Tue, 26 Apr 2011 17:17:33 +0200
Cc: David McNeil <dmcneil@revelytix.com>, RDB2RDF WG <public-rdb2rdf-wg@w3.org>
Message-Id: <E43950B9-2AC1-43BF-9EC9-93534DA73054@w3.org>
To: Alexandre Bertails <bertails@w3.org>

On Apr 26, 2011, at 17:11 , Alexandre Bertails wrote:

> On Tue, 2011-04-26 at 09:53 -0500, David McNeil wrote:
>> 
>>> 
>>>> If the user wants a hybrid of these two models then they
>>        can generate the Direct Mapping for an RDB and then replace
>>        parts of it with a hand-crafted R2RML mapping.
>>>> 
>>> 
>>> I am not sure I understand that one. You mean generate an
>>        R2RML that would correspond to a Direct Mapping?
>>> 
>>> 
>>> What I mean is to use a Direct Mapping tool to produce an
>>        R2RML mapping file for an RDB.
>> 
>> 
>>        Yes, that is what I meant. An R2RML representation of the DM
>>        results for that particular RDB.
>> 
>>        If we go down that route, it would be worthwhile having an
>>        appendix in either the r2rml or the dm document that gives a
>>        precise mapping of the dm to r2rml. This should not be left to
>>        implementers to be figured out separately.
>> 
>> Agreed. I was thinking the Direct Mapping was expressed in terms of
>> R2RML, but I see now that is not the case.
> 
> The Direct Mapping was never intended to be "expressed in terms of
> R2RML". But I agree that there could a section about it in the spec.
> Just remember this will never be the normative definition of the Direct
> Mapping. And the mapping itself will be parameterized by an instance of
> RDB.

Agreed and agreed:-) It should be in an informative appendix of one of the two specs.

Ivan

> 
> Alexandre.
> 
>> 
>> -David
>> 
> 
> 


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Received on Tuesday, 26 April 2011 15:16:33 UTC

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