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Re: Dereferencing a URI vs querying a SPARQL endpoint

From: Roberto García <rogargon@gmail.com>
Date: Thu, 21 May 2009 15:00:24 +0200
Message-ID: <e56f135c0905210600q15926bf9u9b06ac5b24c3650b@mail.gmail.com>
To: public-lod@w3.org, "semantic-web@w3.org" <semantic-web@w3.org>
Hi,

> Ok so even if this sounds like a good choice, its easy to see that in
> practice this is not sufficient, e.g. james bond would be a URI with
> no label if you fetch any of the other 2 nodes.

This is particularly important if we take into account usability.

> So probably a "SCBDwL" (with labels (and types) :-) ) is in fact more
> like what's needed..

This is the approach we have followed in Rhizomer [1], concretely we
offer CBDwL as the response for user queries (SPARQL Describes) or URI
dereferencing, and the user can choose interactively to get the
symmetric CBDwL in order to keep the volume of data shown to the user
simultaneously low.

There is a graphical representation of a CBDwL at:
http://rhizomik.net/rhizomer/howto/#Browse

By the way, are CBDwL or SCBDwL "accepted terms" in the sense that
they are, for instance, accepted values in voiD?

Best,


Roberto García
http://rhizomik.net/~roberto


[1] http://rhizomik.net/rhizomer/
- Hide quoted text -

> Giovanni
>
>
>
>
> On Thu, May 21, 2009 at 12:02 AM, Daniel Schwabe
> <dschwabe@inf.puc-rio.br> wrote:
>> On 20/05/2009 17:14, Hugh Glaser wrote:
>>>
>>> Sorry, I'll try harder :-)
>>> I understand that what you are asking is something like this.
>>> For some sites (including rkbexplorer), when you resolve a URI, it
>>> constructs a SPARQL query and returns the result of the query.
>>> This might be all the triples with the subject, or object, or both, or
>>> something more complex that takes into account b-nodes.
>>> So it might be nice if somewhere, such as the sitemap.xml, this query was
>>> documented.
>>> I think this is exactly what the "slicing" is trying to do, but instead of
>>> publishing the actual query, it names the common (obvious) ones to use.
>>> So a "slicing" of "subject" would tell you that you could do the query you
>>> say below on the appropriate SPARQL endpoint and get exactly the same thing
>>> you would get by resolving the URI.
>>> So I still think that answers your question, but I'm sure you can tell me
>>> if it doesn't :-)
>>>
>>>
>>
>> Ok, I see your point. However, I don't see *which* of the various slicings
>> described is the one returned (ie, the equivalent query) when I resolve a
>> URI... or do you mean it is always the "subject" slicing? Where is this
>> stated that this slicing is what you get when resolving the URI?
>>
>> Cheers
>> D
>>
>>
>>
>>
>>
>>
>
>
Received on Thursday, 21 May 2009 13:01:08 GMT

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