Fantastic!
That's what I was needing!
Thanks a lot!!
On Thursday, July 31, 2014 2:11:28 AM UTC-3, Holger Knublauch wrote:
>
> On 7/31/2014 14:45, Jorge Gastaldi wrote:
>
> This is basically what I'm doing. "query" is the SPARQL query string. I
> will turn it into a Model, modify it and then, I want to rebuild it.
>
>
> SPINModuleRegistry.get().init();
> // Create an empty OntModel importing SP
> Model model = ModelFactory.createDefaultModel();
> model.setNsPrefix("rdf", RDF.getURI());
> model.setNsPrefix("dbpedia", "http://dbpedia.org/resource/";
> <http://dbpedia.org/resource/>);
> Query arqQuery = ARQFactory.get().createQuery(model, query);
> ARQ2SPIN arq2SPIN = new ARQ2SPIN(model);
> Select spinQuery = (Select) arq2SPIN.createQuery(arqQuery, null);
>
>
> // Then I add some rules to the model
> Model modeloReglas = ModelFactory.createDefaultModel();
> modeloReglas.read("reglas.ttl");
> modeloConsulta.add(modeloReglas);
>
>
> // And run the inferences (following another example from SPIN-API)
> OntModel ontModel = JenaUtil.createOntologyModel(OntModelSpec.OWL_MEM,
> modeloConsulta);
> Model newTriples = ModelFactory.createDefaultModel();
> ontModel.addSubModel(newTriples);
> SPINInferences.run(ontModel, newTriples, null, null, false, null);
>
>
> At this stage I assume you want to execute rules that add triples to the
> existing Select? If that is the case then you should do
>
> ontModel.addSubModel(model);
>
> before running the inferences to make sure that the rules also "see" that
> existing Select. The Jena resource of that Select would still be the same,
> only that you need to redirect it into the ontModel so that it also "sees"
> the inferred triples:
>
> spinQuery = (Select) SPINFactory.asQuery(spinQuery.inModel(ontModel));
>
> If you then want to convert this Select back into a valid SPARQL string,
> make sure that you had switched off the cache of the ARQFactory beforehand
> - otherwise it may believe that it has seen this query before and used a
> cached copy of the string:
>
> ARQFactory.get().clearCaches();
>
> But again, I am not sure if we are talking about the same problem. Maybe
> your rules are in fact producing a completely new instance of sp:Select? In
> that case, find it via Jena using
>
> Resource newSelect = newTriples.listSubjectsWithProperty(RDF.type,
> SP.Select).next();
>
> which should give you the first (and only) instance of sp:Select in the
> inferences, and then you can use SPINFactory to turn it into a Select
> instance etc.
>
> HTH
> Holger
>
> The inference rules add valid (I hope) triples to the SPIN SPARQL
> query.
> At this point I have a model that has both a SPARQL Query (the original
> with aditional parts) and some SPIN rules. I want to get the query from the
> model (i can remove the rules from the model, if necesary).
> There is a similar question in the mailing list, but in that case the
> query was the body of a template, so it's easy to get the Resource. Here
> the query it's something like this:
>
> [ a <http://spinrdf.org/sp#Select>
> <http://spinrdf.org/sp#Select> ;
> <http://spinrdf.org/sp#resultVariables>
> <http://spinrdf.org/sp#resultVariables>
> ( [ <http://spinrdf.org/sp#varName>
> <http://spinrdf.org/sp#varName>
> "a"^^<http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ] [
> <http://spinrdf.org/sp#varName> <http://spinrdf.org/sp#varName>
> "b"^^<http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ] [
> <http://spinrdf.org/sp#varName> <http://spinrdf.org/sp#varName>
> "c"^^<http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ] ) ;
> <http://spinrdf.org/sp#where> <http://spinrdf.org/sp#where> ( [
> <http://spinrdf.org/sp#object> <http://spinrdf.org/sp#object> [
> <http://spinrdf.org/sp#varName> <http://spinrdf.org/sp#varName>
> "c"^^
> <http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ] ;
> <http://spinrdf.org/sp#predicate>
> <http://spinrdf.org/sp#predicate>
> [
> <http://spinrdf.org/sp#varName> <http://spinrdf.org/sp#varName>
> "b"^^
> <http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ] ;
> <http://spinrdf.org/sp#subject>
> <http://spinrdf.org/sp#subject>
> [
> <http://spinrdf.org/sp#varName> <http://spinrdf.org/sp#varName>
> "a"^^
> <http://www.w3.org/2001/XMLSchema#string>
> <http://www.w3.org/2001/XMLSchema#string> ]
> ] )
> ] .
> As I say early, probably the answer is trivial.
>
> Thanks for your patience,
> Jorge
>
>
>
>
> On Wednesday, July 30, 2014 4:21:18 AM UTC-3, Holger Knublauch wrote:
>>
>> On 7/30/2014 15:42, Jorge Gastaldi wrote:
>> >
>> > Thanks for your answer!
>> >
>> >
>> > I think that the problem is that I don't know how to create the Select
>> > object ("spinQuery" in the example) without refering to the query
>> string.
>> >
>> > From the example:
>> > Select spinQuery = (Select) arq2SPIN.createQuery(arqQuery, null);
>> >
>> > arqQuery was created using the query String. I only have the Jena
>> Model.
>> >
>> >
>> > This is problably something trivial, but I'm quite at loss here.
>>
>> So is your starting point a Jena Resource instance? To convert that into
>> a Select, use SPINFactory.asQuery(resource)
>>
>> If this doesn't help, I need to see a source code snippet where you are
>> stuck.
>>
>> HTH
>> Holger
>>
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