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Re: Querying different SPARQL endpoints

From: Hugh Glaser <hg@ecs.soton.ac.uk>
Date: Wed, 19 Dec 2012 19:19:51 +0000
To: Vishal Sinha <vishal.sinha777@yahoo.com>
CC: "public-lod@w3.org" <public-lod@w3.org>
Message-ID: <387E72E216DF1247A2F8ED4819C93BA71E3C0A8C@UOS-MSG00041-SI.soton.ac.uk>
You can start querying for stuff, but I am guessing that what you mean is how can you find out what is in the store without starting to query.

Well if you are lucky:
There is a sitemap.xml, which points you at a voiD document that tells you some of what you want to know, such as what the topics of the dataset are.
For example, our http://acm.rkbexplorer.com/ has http://acm.rkbexplorer.com/sitemap.xml which points at http://acm.rkbexplorer.com/models/void.ttl
Or you might be able to find the voiD document some other way.

I'm afraid you are unlikely to be lucky, though - not many people publish voiD data.
(A while ago we tried to harvest it, and you will find the results at http://void.rkbexplorer.com)

Also, looking in the catalogue at http://datahub.io/ may provide information you can use.

On 19 Dec 2012, at 18:28, Vishal Sinha <vishal.sinha777@yahoo.com>

> There are many public SPARQL endpoints available. 
> For example the cultural linked data:
> http://cultura.linkeddata.es/sparql
> How can I know what type of information is available in this dataset.
> Based on what assumption I can query it? 
> Do I need to know any structure beforehand?
> Viashal
Received on Wednesday, 19 December 2012 19:20:25 UTC

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