> On Sep 10, 2015, at 2:20 PM, Andy Seaborne <[email protected]> wrote:
>
> On 10/09/15 19:06, Mark Feblowitz wrote:
>> I didn’t quite care that it was JSON-LD - only that I could get json to be
>> emitted. the application/rdf+json worked for this.
>>
>> I’m using fuseki 1.0.1 at the moment.
>
> There wasn't JSON-LD in Fuseki 1.0.0
>
Upgraded to Fuseki 1.3.0. Seems to require Java 8.
application/sparql-results+json returned RDF XML for me.
The Accept header application/ld+json worked, and provides an option for
post-query transformation.
>>
>> When you say it worked for you, was that with CONSTRUCT or SELECT?
>
> CONSTRUCT and DESCRIBE
>
> SELECT does not return graphs.
>
> application/sparql-results+json returns JSON rsult sets.
>
>>
>>
>> Now I have a wish: As I’m viewing the results as output using
>> application/rdf+json, I am noticing that it’s very basic triples. What the
>> consumer of this result really wants is a hybrid of triples and resultsets.
>> So, it produces triples as specified in the CONSTRUCT and it also
>> incorporates variable names into the JSON, as present in resultsets.
>
> Talis's RDF/json format is intentionally simple.
>
>>
>> That is, the emitted json is presented as URIs for the Subject, Predicate,
>> and Object (with additional syntax to handle sub-parts and arrays of
>> Objects). Tthe hybrid would somehow also incorporate variable names, so
>> instead of URI-S URI-P URI-O it would be something like
>>
>> { S : {id : URI-S, [ { P: {id: URI-P, [ O: {id: URI-O} ] ] }} ] } }
>>
>> where S, P, and O would be ?S, ?P, and ?O.
>>
>> Doable? Something JSON-LD might be able to handle?
>
> application/sparql-results+json ?
>
> Otherwise you'll need to add an output format. Though easier maybe 3-tier:
> use Fuseki as the database layer and have custom formatter as a webservice
> running as a logic layer.
>
> Or maybe Elda
>
> http://www.epimorphics.com/web/tools/elda.html
>
>>
>> Thanks
>>
>>
>>
>>> On Sep 10, 2015, at 1:39 PM, Andy Seaborne <[email protected]> wrote:
>>>
>>> On 10/09/15 18:20, Mark Feblowitz wrote:
>>>> Ok -
>>>>
>>>> I tested all forms that you recommended, and the one that does work is
>>>> application/rdf+json.
>>>
>>> Caveat - that's not JSON-LD.
>>> https://jena.apache.org/documentation/io/rdf-json.html
>>>
>>>> Thanks very much for the suggestion!
>>>>
>>>> Mark
>>>>
>>>>> On Sep 10, 2015, at 12:16 PM, Mark Feblowitz <[email protected]>
>>>>> wrote:
>>>>>
>>>>> That makes sense. But it doesn’t seem to work. I still get it in RDF XML
>>>>> format.
>>>>>
>>>>> I’m wondering whether the problem is with how I’m submitting the query.
>>>>>
>>>>> I’m using curl as follows:
>>>>>
>>>>> curl -v -H "Content-Type:application/sparql-query" -H “Accept:
>>>>> application/ld+json" -X POST http://host:port/ds/sparql
>>>>> <http://host:port/ds/sparql> -d …
>>>
>>> Works for me (Fuseki1 and Fuseki2, latest).
>>>
>>> Which version of Fuseki? (did it have JSON-LD?)
>>>
>>> Andy
>>>
>>>>>
>>>>> Should I instead be using a URL parameter?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Mark
>>>>>
>>>>>
>>>>>> On Sep 9, 2015, at 1:33 PM, Colin Maudry <[email protected]
>>>>>> <mailto:[email protected]>> wrote:
>>>>>>
>>>>>> Hi Mark,
>>>>>>
>>>>>> This is because CONSTRUCT doesn't return query results (a table
>>>>>> structure), but a graph.
>>>>>>
>>>>>> Two possibilities :
>>>>>>
>>>>>> * If you want to stick to your CONSTRUCT query and want JSON out, you
>>>>>> should request JSON-LD[1] with "application/ld+json". You can also
>>>>>> try "application/json" or "application/rdf+json" to get RDF/JSON (I
>>>>>> never tried). According to the spec[2], you're encouraged to use
>>>>>> JSON-LD instead.
>>>>>> * If you really want JSON SPARQL results, that's a SELECT query that
>>>>>> you need to post.
>>>>>>
>>>>>> I hope it helps.
>>>>>>
>>>>>> Colin Maudry
>>>>>>
>>>>>> [1] http://www.w3.org/TR/json-ld/ <http://www.w3.org/TR/json-ld/>
>>>>>> [2] http://www.w3.org/TR/rdf-json/ <http://www.w3.org/TR/rdf-json/>
>>>>>>
>>>>>>
>>>>>> On 09/09/2015 18:58, Mark Feblowitz wrote:
>>>>>>> At my wits’ end here - when I invoke a SPARQL using curl to a local
>>>>>>> Fuseki server, and the query is a construct query, and I specify
>>>>>>>
>>>>>>> -H “Accept: application/sparql-results+json”
>>>>>>>
>>>>>>> or
>>>>>>> -H “Accept: application/sparql-results%2Bjson”
>>>>>>>
>>>>>>> I consistently get results back in RDF/XML
>>>>>>>
>>>>>>> <rdfs99:RDF
>>>>>>> xmlns:dp="http://dbpedia.org/property/
>>>>>>> <http://dbpedia.org/property/>"
>>>>>>> xmlns:yago="http://dbpedia.org/class/yago/
>>>>>>> <http://dbpedia.org/class/yago/>"
>>>>>>> xmlns:nsl="http://purl.org/ontology/storyline/“
>>>>>>> <http://purl.org/ontology/storyline/%E2%80%9C>
>>>>>>> ...
>>>>>>>
>>>>>>> With no "-H Accept…”, I’m seeing triples format.
>>>>>>>
>>>>>>> In fact, no matter what I set the Accept header to, I see rdf/xml.
>>>>>>> Without an Accept: header, I see ntriples.
>>>>>>>
>>>>>>> Any ideas?
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>
