Hi Andrea,
Can I suggest trying this ..
SELECT ?s
WHERE {
GRAPH <http://graph1.com> {
?s ?p ?o
}
}
On Wed, May 13, 2015 at 1:26 PM, Andrea Gazzarini <[email protected]> wrote:
> Hi,
> A question about the FROM keyword. I have the following data
>
> <http://graph1.com> = { <http://a.b.c/s1> <http://a.b.c/p1> <
> http://a.b.c/o1>
> . }
> <http://graph2.com> = { <http://a.b.c/s2> <http://a.b.c/p2> <
> http://a.b.c/o2>
> . }
>
> For simplicity, I created a file for each triple (file1.nt and file2.nt).
> Then, I loaded those data using the following code:
>
> Dataset memoryDataset = DatasetFactory.createMem();
> Model memoryModel = ModelFactory.createDefaultModel();
> memoryModel.read(new FileReader("file1.nt"), "http://e.org";, "N-TRIPLE");
> memoryDataset.addNamedModel("http://graph1.com";, memoryModel);
>
> memoryModel = ModelFactory.createDefaultModel();
> memoryModel.read(new FileReader("file2.nt"), "http://e.org";, "N-TRIPLE");
> memoryDataset.addNamedModel("http://graph2.com";, memoryModel);
>
> I'm not understanding the results coming from the following query:
>
> SELECT ?s FROM <http://graph1.com> { ?s ?p ?o }
>
> ?s = <nothing>
>
> I was expecting
>
> ?s=<http://a.b.c/s1>
>
> Am I missing something? I'm using Jena 2.12.1
>
> Thanks in advance for your help
> Andrea
>
