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

Re: Section 4: LDPR/non-LDPR formal definitions

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 26 Mar 2013 15:18:37 -0400
Message-ID: <5151F48D.7050301@openlinksw.com>
To: public-ldp@w3.org
On 3/26/13 2:40 PM, Erik Wilde wrote:
> hello henry.
>
> On 2013-03-26 10:03 , Henry Story wrote:
>> On 26 Mar 2013, at 17:25, Erik Wilde <dret@berkeley.edu> wrote:
>>> some may be dereferencable, but you don't know which, and you don't 
>>> know the service semantics of doing so.
>> That is not anymore the status quo in RDF land. As Richard just 
>> pointed out, the spec defining
>> RDF graphs says, when explaining what the IRIs in an RDF graph mean  
>> (http://www.w3.org/TR/rdf11-concepts/#referents )
>
> i am really wondering what makes you think that the status quo of RDF 
> being an URI-centric data model has changed in any way. quoting from 
> the section you linked to:
>
> "Perhaps the most important characterisitic of IRIs in web 
> architecture is that they can be dereferenced, and hence serve as 
> starting points for interactions with a remote server. This 
> specification, however, is not concerned with such interactions. It 
> does not define an interaction model. It only treats IRIs as globally 
> unique identifiers in a graph data model that describes resources."
>
> some IRIs can be dereferenced, others not (RDF allows you to use any 
> URI scheme you like). how to dereference IRIs (i.e., how to behave 
> when actually engaging in hypermedia interactions) is out of scope of 
> RDF, as the spec itself says. how much more clear could the spec be?
>
> cheers,
>
> dret.
>
>
Yes, that helps distinguish RDF (the model) from associated media types. 
Drilling down further, we look at the media type definition for 
text/turtle [1] it does infact cover de-reference and denotation. What 
it doesn't cover is the heuristic whereby denotation and de-reference 
are combined to produce a specific kind of interaction; one that 
specifically results in a URI resolving to an RDF based Document that 
describes said URI's referent.

Links:

1. http://www.iana.org/assignments/media-types/text/turtle -- Turtle 
media type definition (Henry: one option would be to update this 
definition such that is clearly incorporates the Linked Data denotation 
and de-reference heuristic I described above)

2. http://www.iana.org/assignments/media-types/text/html -- HTML media 
type definition (Erik: in reading this document I don't see how the HTML 
media type is an exemplar for Hypermedia interaction clarity by virtue 
of media type definition).

-- 

Regards,

Kingsley Idehen	
Founder & CEO
OpenLink Software
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Received on Tuesday, 26 March 2013 19:19:02 UTC

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