W3C home > Mailing lists > Public > public-lod@w3.org > August 2008

Re: Visualizing LOD Linkage

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Wed, 06 Aug 2008 08:01:52 -0400
Message-ID: <489992B0.9010500@openlinksw.com>
CC: public-lod@w3.org

Peter Ansell wrote:
> ----- "Yves Raimond" <yves.raimond@gmail.com> wrote:
>
>   
>> Hello!
>>
>>     
>>> It depends on whether you know that the external references are
>>>       
>> distinct just based on the URI string. If someone links out to
>> multiple formats using external resource links then they would have to
>> be counted as multiple links as you have no way of knowing that they
>> are different, except in the case where you reserve these types of
>> links as RDF literals.
>>     
>> I am not sure if I interpret it correctly - do you mean that you
>> could
>> link to two URIs which are in fact sameAs in the target dataset?
>> Indeed, in that case, the measure would be slightly higher than what
>> it should be. However, I would think that it is rarely (if not never)
>> the case.
>>     
>
>   
Peter,
> I personally don't put sameAs on URI's which relate to the same thing but are really just different representations, ie, the HTML version doesn't get sameAs the RDF version.
>   

I really don't believe anyone in this community advocates using 
owl:sameAs between representations. We use owl:sameAs between Entity 
URIs while representations are negotiated (content negotiation), 
discovered via <link rel=".."/>, or RDFized etc..

If people knowingly mapped owl:sameAs between representations that 
weren't identical, then of course this would be flawed if the 
representations weren't identical. But this isn't what's happening in 
the LOD space in general,  or it's flagship effort: DBpedia.

<http://dbpedia.org/resource/Berlin> is not the representation of the 
entity Berlin, it's a pointer (Identifier) used  by the deploying 
platform to transmit the description of said entity using a 
representations desired by the requester/consumer/agent .  This entire 
mechanism isn't new to computing, it's how all our programs work at the 
lowest levels i.e., we interact with "data by reference" using pointers [2].

This matter is heart and soul of linked data on the Web or across any 
other computing medium that manipulates data.

Links:

1. http://en.wikipedia.org/wiki/Dereferencable_Uniform_Resource_Identifiers
2. http://cslibrary.stanford.edu/104/  (which clearly needs  Linked Data 
Web variant)

Kingsley

>  
>   
> [SNIP]
>> (link appears to be broken)
>>     
>
> Springer Link DOI system must be broken. Try the following
>
> http://www.springerlink.com/content/w611j82w7v4672r3/fulltext.pdf
>
> The following image link is also quite interesting:
>
> http://bio2rdf.wiki.sourceforge.net/space/showimage/bio2rdfmap_blanc.png
>
> Cheers,
>
> Peter
>
>   


-- 


Regards,

Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com
Received on Wednesday, 6 August 2008 12:02:32 UTC

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