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Re: SPARQL and JSON-LD

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 21 Jan 2014 08:01:27 -0500
Message-ID: <52DE6FA7.1060303@openlinksw.com>
To: public-linked-json@w3.org
On 1/21/14 4:42 AM, Andreas Kuckartz wrote:
> Markus Lanthaler:
>> Have a look at https://openrdf.atlassian.net/browse/SES-1998 Apparently someone already started working on it :-)
> That is the kind of information I was looking for ;-)
>
> Cheers,
> Andreas
>
>
Andreas,

You are looking for SPARQL query results serialization in JSON-LD? If 
so, I assume this is for CONSTRUCT and DESCRIBE queries? If so, then I 
think you need to be aware that DBpedia (major Linked Open Data hub) and 
Virtuoso (the RDF supporting DBMS behind DBpedia) have long supported 
JSON-LD results formats [1] for the aforementioned Query Types.

When dealing with SELECTs, the results format is a tabular 
representation, and in this case you have XML or JSON representations 
[2]. What isn't offered is a JSON-LD based self-describing SPARQL result 
which is a consequence of this not really being part of the SPARQL spec. 
That said, we implemented Turtle, RDF/XML, and N-Triples support 
ourselves, and will simply add JSON-LD support for completion, in due 
course.

Links:

[1] 
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=describe+%3FConcept+where+%7B%5B%5D+a+%3FConcept%7D+LIMIT+100&format=application%2Fx-json%2Bld&timeout=30000&debug=on 
-- example of a DESCRIBE query against the DBpedia SPARQL endpoint that 
returns a JSON_LD based description of an entity denoted by an HTTP URI

[2] 
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=select+%3FConcept+where+%7B%5B%5D+a+%3FConcept%7D+LIMIT+100&format=application%2Fsparql-results%2Bjson&timeout=30000&debug=on 
-- JSON based tabular result for a SELECT query .

-- 

Regards,

Kingsley Idehen	
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
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Received on Tuesday, 21 January 2014 13:01:51 UTC

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