Re: Discovering a query endpoint associated with a given Linked Data resource

On 8/27/15 9:18 AM, Simon.Cox@csiro.au wrote:
>
> There is the SPARQL Service Description vocabulary.
>
> http://www.w3.org/TR/sparql11-service-description/
>

I recently tweeted about SPARQL endpoint lists [1][2] from our URIBurner 
Linked Open Data space:

[1] https://twitter.com/kidehen/status/635051731299254272
[2] https://twitter.com/kidehen/status/634346434666569728
[3] http://linkeddata.uriburner.com/c/9DX7S6Q4 -- Paged SPARQL Endpoint 
Listing
[4] http://linkeddata.uriburner.com/c/9CXT67A7 -- Attributes of SPARQL 
Endpoints known to URIBurner.

Kingsley
>
> *From:*Nandana Mihindukulasooriya [mailto:nmihindu@fi.upm.es]
> *Sent:* Wednesday, 26 August 2015 6:46 PM
> *To:* public-lod <public-lod@w3.org>
> *Subject:* Discovering a query endpoint associated with a given Linked 
> Data resource
>
> Hi,
>
> Is there a standard or widely used way of discovering a query endpoint 
> (SPARQL/LDF) associated with a given Linked Data resource?
>
> I know that a client can use the "follow your nose" and related link 
> traversal approaches such as [1], but if I wonder if it is possible to 
> have a hybrid approach in which the dereferenceable Linked Data 
> resources that optionally advertise query endpoint(s) in a standard 
> way so that the clients can perform queries on related data.
>
> To clarify the use case a bit, when a client dereferences a resource 
> URI it gets a set of triples (an RDF graph) [2].  In some cases, it 
> might be possible that the returned graph could be a subgraph of a 
> named graph / default graph of an RDF dataset. The client wants to 
> discover if a query endpoint that exposes the relevant dataset, if one 
> is available.
>
> For example, something like the following using the "search" link 
> relation [3].
>
> ------
>
> HEAD /resource/Sri_Lanka
>
> Host: http://dbpedia.org
>
> ------
>
> 200 OK
>
> Link: <http://dbpedia.org/sparql>; rel="search"; type="sparql", 
> <http://fragments.dbpedia.org/2014/en#dataset>; rel="search"; type="ldf"
>
> ... other headers ...
>
> ------
>
> Best Regards,
>
> Nandana
>
> [1] 
> http://swsa.semanticweb.org/sites/g/files/g524521/f/201507/DissertationOlafHartig_0.pdf
>
> [2] 
> http://www.w3.org/TR/2014/REC-rdf11-concepts-20140225/#section-rdf-graph
>
> [3] http://www.iana.org/assignments/link-relations/link-relations.xhtml
>


-- 
Regards,

Kingsley Idehen 
Founder & CEO
OpenLink Software
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