Thanks Andy,
That is also what I found out, and I can confirm that using:
SELECT * {
{ ?s ?p ?o } UNION { GRAPH ?g { ?s ?p ?o } }
}
retrieves triples from both default model and named model. But I am
curious to learn about alternatives, because I'd really prefer to do
a CONSTRUCT
query, and I don't think that will work with "GRAPH"
/J
On Tue, May 20, 2014 at 1:29 AM, Andy Seaborne <a...@apache.org> wrote:
> On 20/05/14 08:15, Joakim Soderberg wrote:
>
>> Hi,
>>
>> I create a dataset with a unnamed default model and a named model
>>
>> mDataset = TDBFactory.createDataset(tdbDirectory);
>>
>> mDefaultModel = mDataset.getDefaultModel();
>> mDefaultModel = FileManager.get().loadModel(coreOntologyFile);
>>
>>
>> Model rtmodel = FileManager.get().loadModel("ontology/data1221.rdf");
>> if (mDataset.containsNamedModel("r1221"))
>> {
>> mDataset.getNamedModel("r1221");
>> } else {
>> mDataset.getDataSet().addNamedModel("rt1221", rtmodel);
>> }
>>
>>
>>
>> From what I read, passing a dataset and not specifying "FROM NAMED" in
>> the
>> sparql query, should query both the unnamed model and named model, but it
>> only queries the default data set, e.g.
>>
>>
>> QueryExecution qe1 = QueryExecutionFactory.create( "SELECT * WHERE { ?s ?p
>> ?o }", mDataset );
>>
>> only returns data from the defaultmodel, unless if I explicitly pass the
>> named model
>>
>> QueryExecution qe1 = QueryExecutionFactory.create( "SELECT * WHERE { ?s ?p
>> ?o }", mDataset.getNamedModel("r1221") );
>>
>> then I get triples from the named model. Adding FROM NAMED <e1221>
>>
>> "SELECT * FROM NAMED <r1221> WHERE { ?s ?p ?o> }", mDataset
>>
>> Does not help. Has anyone had the same problem?
>>
>
> try this query:
>
> SELECT * {
> { ?s ?p ?o } UNION { GRAPH ?g { ?s ?p ?o } }
> }
>
> "SELECT * WHERE { ?s ?p ?o }" only accesses the default graph. You need
> GRAPH to get to the named graphs.
>
> You can have many named graphs and make the default graph of the query by
> the union of all named graphs (see documentation [*]), but the stored
> default graph isn't then visible in { ?s ?p ?o }
>
> Andy
>
> [*] http://jena.apache.org/documentation/tdb/datasets.html
>
>
>> best
>> J
>>
>>
>
