W3C home > Mailing lists > Public > public-lod@w3.org > March 2013

Re: Important Change to HTTP semantics re. hashless URIs

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Sun, 24 Mar 2013 14:29:07 -0400
Message-ID: <514F45F3.1020402@openlinksw.com>
To: public-lod@w3.org
On 3/24/13 2:05 PM, David Wood wrote:
> On Mar 24, 2013, at 13:52, Richard Cyganiak <richard@cyganiak.de> wrote:
>> On 24 Mar 2013, at 17:39, Kingsley Idehen <kidehen@openlinksw.com> wrote:
>>> Thus, if a client de-references the URI <http://dbpedia.org/resource/Barack_Obama> and it gets a 200 OK from the server combined with <http://dbpedia.org/page/Barack_Obama> in the Content-Location response header, the client (user agent) can infer the following:
>>> 1. <http://dbpedia.org/resource/Barack_Obama> denotes the real-world entity 'Barack Obama' .
>> Why can a client make this inference? I can't see any basis for the inference that the URI identifies a “real-world entity”. The described interaction does not provide any information regarding the nature of the identified resource, AFAICT.
> Right, "the sender asserts that the payload is a representation of the resource identified by the Content-Location field-value".
> So, the sender (DBpedia) asserts that http://dbpedia.org/resource/Barack_Obama is a REPRESENTATION of the resource http://dbpedia.org/resource/Barack_Obama, but the recipient has no way to know that the resource http://dbpedia.org/resource/Barack_Obama is a real-world entity…

I used real-world to make a point that's utterly lost. I could have 
simply said: entity not of the Web :-)

The server responds with a 200 OK to 
<http://dbpedia.org/resource/Barack_Obama> while also providing 
<http://dbpedia.org/page/Barack_Obama> in the Content-Location header.

Linked Data Inference: the server has provided a content location 
(document URL)  for the URI in the request. Thus you have:

1. a URI or URL that denotes the document that describes the entity 
denoted by <http://dbpedia.org/resource/Barack_Obama>
2. a URI that denotes the entity of type: anything but a Web or Internet 
resource -- the rest of the definition is expressed and decipherable 
from the content of the description document.

> One really nice way to say that http://dbpedia.org/resource/Barack_Obama is real-world entity is for RDF returned by http://dbpedia.org/resource/Barack_Obama to say so :)

As articulated in my response above.

> Regards,
> Dave
> --
> http://about.me/david_wood
>> Best,
>> Richard



Kingsley Idehen	
Founder & CEO
OpenLink Software
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Received on Sunday, 24 March 2013 18:29:29 UTC

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