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Re: Several questions about Linked Data

From: Richard Light <richard@light.demon.co.uk>
Date: Wed, 23 Mar 2011 10:08:45 +0000
Message-ID: <cQqVBzdtaciNFwdN@light.demon.co.uk>
To: Tim Berners-Lee <timbl@w3.org>
Cc: wenlei zhou <wenlei.zhouwl@gmail.com>, public-lod@w3.org
In message <74B25DFC-0F3B-439E-861F-90FB25D4F417@w3.org>, Tim 
Berners-Lee <timbl@w3.org> writes
>When you have a triple which is in your linked data set
>which includes a URI in another dataset, then that is called a link.
>Just as when you have an HTML document which has the URI
>of an anchor of another HTML document.
>Not sure why you say there is no real linking going on.
>You can follow the links with a (RDF) browser,
>you need to do link maintenance just like for HTML links if the other 
>server goes away, etc

I told you others might offer differing views!  Good morning, sir.

Yes, it's true that Linked Data URLs are (or ought to be) 
dereferenceable, but following that link only takes you to one place: 
back to their publisher. This doesn't help you to know that, say, 15 
other datasets are all using Geonames URLs to express geographical 

I took Zhou's question to be about the need for a separate mechanism for 
connecting data sets, above and beyond the use of the same URI to 
represent the same concept.


>On 2011-03 -23, at 15:02, Richard Light wrote:
>> In message 
>><AANLkTi=vY_7qWK2+ZS97erTOUzim42KsYTZH3EcRrWH7@mail.gmail.com>, wenlei 
>>zhou <wenlei.zhouwl@gmail.com> writes
>>> Hi, every one
>>> I'm a novice to Linked Data. In the learning of linked data, I got several
>>> questions.
>>> 1. When public a new data set, how does it connect to other data sets in
>>> the Linked Data Cloud. Just use the record linkage techniques to connect
>>> two identifiers which are actually telling the same entity? Or, is this
>>> method only applied to publishing large new data set, not small one?
>>> 2. Where is the rdf data stored, which connects two data sets?  Is it just
>>> stored in a third party?
>> Hi,
>> The way I see it, the name "Linked Data" isn't totally helpful. It 
>>should be "Linkable Data" or "Potentially Linked Data". There is no 
>>actual "connection to other data sets" going on, except by the 
>>well-established web techniques of spidering Linked Data resources, 
>>and aggregating what is found into a single point of search.
>> What "connects two data sets" is simply the fact that they [may] use 
>>the same URL to represent the same concept, and that they express 
>>statements in a simple graph language which makes it easy to merge 
>>sets of statements from different sources, and to query across them 
>>without the need for physical merging.
>> Others may offer differing views on this issue ...
>> Best wishes,
>> Richard
>> --
>> Richard Light
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Richard Light
Received on Wednesday, 23 March 2011 10:10:41 UTC

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