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Re: owl:sameAs - Is it used in a right way?

From: Michel Dumontier <michel.dumontier@gmail.com>
Date: Thu, 21 Mar 2013 12:26:40 -0400
Message-ID: <CALcEXf6DpnW4W2qcXO88SEiK1x3UMFvnia69EbbnqAFNpTqjxA@mail.gmail.com>
To: Kingsley Idehen <kidehen@openlinksw.com>
Cc: public-semweb-lifesci@w3.org
my problem largely lies in the "identifies" relation between a URI and a
document. and generally, that it wouldn't represent as a triad, but a
bilateral relation between an entity (identified by uri) and a document
(which refers or describes it).

m.

On Thu, Mar 21, 2013 at 11:05 AM, Kingsley Idehen <kidehen@openlinksw.com>wrote:

>  On 3/21/13 10:57 AM, Michel Dumontier wrote:
>
> Kingsley,
>  I think you raise good points. I also nominally speak of entities, their
> attributes and the relations that hold between them. But I think your
> diagram is somewhat misleading. URIs do denote (can stand in the place of)
> entities of interest in order to refer to and/or describe them. If you
> separate the identifier from what it intends to identify, then you'll need
> another identifier for the object of interest (and recurse). Hence, a
> information containing object (document, graph, file, etc) may refer to our
> entity of interest by some label. the document could refer to it in some
> statement, or may contain elaborate descriptions about it.  But in no way
> does a document directly refer to a real world object (in does so
> indirectly through some token - an english name, identifier or uri, etc).
>
>  m.
>
>
> I don't see how my illustration conveys anything contrary to what you've
> just outlined. The parts:
>
> 1. An entity (in this case a Person) -- a real-world or non Web realm
> entity
> 2. An identifier that denotes the Person -- e.g., a URI
> 3. A document that describes the person -- e.g. a Document comprised of
> RDF model based content in the form of an description graph (you can have
> many of these, each denoted with its own URI-URL based identifier).
>
> Note: URI-URL is how I convey the fact that you can denote a Web Document
> using its URL. Thus, Turtle, RDF/XML, RDFa+(X)HTML etc.. documents (each
> with their own URI-URLs) can each be comprised of graphs describing the
> same entity.
>
> Kingsley
>
>
>
>
>
> On Thu, Mar 21, 2013 at 10:27 AM, Kingsley Idehen <kidehen@openlinksw.com>wrote:
>
>>  On 3/20/13 10:58 PM, David Booth wrote:
>>
>>
>> Thus, to be very clear, under the existing RDF Semantics specification, a
>> given URI does **not** necessarily map to only one resource.
>>
>>
>>  True, but I don't think the statement above always provides the clarity
>> intended.
>>
>> "Resource" is a synonym of "Entity" as *now* clearly stated in the latest
>> RDF concepts guide [1]. Once we get over the conflation inherent in
>> "Resource" and look towards "Entity" the issue starts to get much clearer,
>> as exemplified by RDF based Linked Data [2] and its specific use of URIs to
>> denote "Entities" while also identifying their "Descriptor Documents".
>>
>> All "Resources" aren't of the same medium. The Web, Internet are mediums
>> distinct from the medium we *refer to* as the real-world. Thus, the claim
>> that everything is a "Resource" without medium specificity is one of the
>> ultimate recipes for unproductive debate and confusion, as a zillion mail
>> threads over the years have demonstrated.
>>
>> In the context of RDF, a URI denotes an Entity.
>> In the context of RDF based Linked Data, a URI denotes an Entity in a
>> manner that enables it resolve to a Web Document (denoted by its own URI
>> which is usually a URL) that describes the denoted entity (aka. URI
>> referent) .
>>
>>
>> Links:
>> 1. http://www.w3.org/TR/rdf11-concepts/#resources-and-statements --
>> showcasing the critical "Resource" fix
>> 2. http://twitpic.com/cbk8ul -- illustrating HTTP URI duality and the
>> Semiotic triangle .
>>
>>
>> --
>>
>> Regards,
>>
>> Kingsley Idehen	
>> Founder & CEO
>> OpenLink Software
>> Company Web: http://www.openlinksw.com
>> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
>> Twitter/Identi.ca handle: @kidehen
>> Google+ Profile: https://plus.google.com/112399767740508618350/about
>> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>>
>>
>>
>>
>
>
>  --
> Michel Dumontier
> Associate Professor of Bioinformatics, Carleton University
> Chair, W3C Semantic Web for Health Care and the Life Sciences Interest
> Group
> http://dumontierlab.com
>
>
>
> --
>
> Regards,
>
> Kingsley Idehen	
> Founder & CEO
> OpenLink Software
> Company Web: http://www.openlinksw.com
> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
> Twitter/Identi.ca handle: @kidehen
> Google+ Profile: https://plus.google.com/112399767740508618350/about
> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>
>
>
>


-- 
Michel Dumontier
Associate Professor of Bioinformatics, Carleton University
Chair, W3C Semantic Web for Health Care and the Life Sciences Interest Group
http://dumontierlab.com
Received on Thursday, 21 March 2013 16:27:31 UTC

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