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Re: Terminology Question concerning Web Architecture and Linked Data

From: Tim Berners-Lee <timbl@w3.org>
Date: Wed, 25 Jul 2007 09:44:54 -0400
Message-Id: <8B806DA0-BB1C-4F27-B12C-087CAFE08450@w3.org>
Cc: Chris Bizer <chris@bizer.de>, www-tag@w3.org, semantic-web@w3.org, Linking Open Data <linking-open-data@simile.mit.edu>
To: Dan Connolly <connolly@w3.org>

Ooops ... I missed this ...you said exactly what I wanted to say.
Tim

On 2007-07 -10, at 13:08, Dan Connolly wrote:

>
> On Sat, 2007-07-07 at 14:43 +0200, Chris Bizer wrote:
>> Hi all,
>>
>> Richard Cyganiak, Tom Heath and me are currently writing a  
>> tutorial on how
>> to publish Linked Data [1] on the Web and ran into some terminology
>> questions concerning Web Architecture.
>>
>> Here is the problem statement together with an example: Within the  
>> Linking
>> Open Data community project [2] different data sources (URI  
>> owners) publish
>> information about Tim Berners-Lee using different HTTP URIs:
>>
>> 1. DBpedia: http://dbpedia.org/resource/Tim_Berners-Lee
>> 2. Hannover DBLP Server:
>> http://dblp.l3s.de/d2r/resource/authors/Tim_Berners-Lee
>> 3. Berlin DBLP Server:
>> http://www4.wiwiss.fu-berlin.de/dblp/resource/person/100007
>> 4. RDF Book Mashup:
>> http://www4.wiwiss.fu-berlin.de/bookmashup/persons/Tim+Berners-Lee
>>
>> The first 3 data sources follow the W3C TAG "Dereferencing HTTP URIs"
>> finding [3]
>
> draft, in progress...
>
>>  and redirect via HTTP 303 to documents describing Tim
>> Berners-Lee when the URIs are dereferenced over the Web.  
>> Therefore, the URIs
>> identify Tim Berners-Lee as a non-information resource.
>
> Rather: therefore the do not claim that these URIs
> identify information resources.
>
> The lack of a claim is very different from the negation of a claim.
>
>>  This redirect also
>> supports HTTP content negotiation and leads to HTML as well as RDF
>> descriptions of Tim.
>>
>> 5. Tim also publishes a FOAF profile in which he assigns the URI
>> http://www.w3.org/People/Berners-Lee/card#i to himself.
>>
>> Question 1: According to the terminology of the Architecture of  
>> the WWW
>> document [4] are all these URIs aliases for the same non-information
>> resource (our current view) or are they referring to different  
>> resources?
>
> They are aliases: the URI owners say so and nothing in webarch
> says otherwise.
>
>> Does the TAG finding "On Linking Alternative Representations To  
>> Enable
>> Discovery And Publishing " [5] about generic and specific  
>> resources apply
>> here, meaning that the URIs 1,2,3,5 refer to different specific
>> non-information resources that are related to one generic non- 
>> information
>> resource?
>
> No, I don't think so.
>
> The generic resource finding is mostly about information resources, I
> think.
>
>> Question 2: When the URIs are dreferenced they provide quite  
>> different
>> information about Tim, which reflects the knowledge and the  
>> opinion of the
>> specific URI owner about him. Within our tutorial we need to talk  
>> about this
>> information and therefore need a term to refer to a concept that  
>> can be
>> described as "information provided by a specific URI owner about a
>> non-information resource", for example Tim. Depending on the  
>> answer to
>> question 1, what would be the correct Web Architecture term to  
>> refer to this
>> concept? Or is such a term missing?
>
> I don't think the TAG has established a term for that.
>
> (It sounds a bit like log:semantics from N3, but I'm not quite sure
> http://www.w3.org/2000/10/swap/doc/Reach )
>
>> Question 3: Depending on the answer to question 1, is it correct  
>> to use
>> owl:sameAs [6] to state that http://www.w3.org/People/Berners-Lee/ 
>> card#i and
>> http://dbpedia.org/resource/Tim_Berners-Lee refer to the same  
>> thing as it is
>> done in Tim's profile.
>
> Yes...
>
> That's sort of a circular question. It's correct because Tim says
> it's correct, and he owns that name.
>
>> Any clarifications on these question would be highly welcomed.
>>
>> Cheers
>>
>> Chris
>>
>>
>> [1] http://www.w3.org/DesignIssues/LinkedData.html
>> [2]
>> http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/ 
>> LinkingOpenData
>> [3] http://www.w3.org/2001/tag/doc/httpRange-14/2007-05-31/ 
>> HttpRange-14
>> [4] http://www.w3.org/TR/webarch/
>> [5] http://www.w3.org/2001/tag/doc/alternatives-discovery.html
>> [6] http://www.w3.org/TR/owl-ref/#sameAs-def
>>
>> --
>> Chris Bizer
>> Freie Universitšt Berlin
>> +49 30 838 54057
>> chris@bizer.de
>> www.bizer.de
>>
> -- 
> Dan Connolly, W3C http://www.w3.org/People/Connolly/
>
>
Received on Wednesday, 25 July 2007 13:45:00 GMT

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