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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 09:35:02 -0400
Message-Id: <67B8A6FE-4DC9-47C5-B505-3A761188A205@w3.org>
Cc: <www-tag@w3.org>, <semantic-web@w3.org>, "Linking Open Data" <linking-open-data@simile.mit.edu>
To: Chris Bizer <chris@bizer.de>

(Going back to the original question, as it is much simpler than much  
which follows!)

On 2007-07 -07, at 08:43, 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]  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. 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 indeed all aliases, in that they identify the same thing.

> 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?

That finding doesn't really apply. It is about representations of  
Information Resources. The TAG has not ((yet) written much about  
semantic web architecture. I think it should.

> 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 can't think of a term for "the information which you get about the  
thing identified by it  when you look up a URI" which works for me.

  It has of course the term "Representation" which connects an  
Information Resource and the (metadata, bits) pair which you get  
back, which is different.

> 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.

>
> 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
Received on Wednesday, 25 July 2007 13:35:11 GMT

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