semantic web - How to import rdf file into named graph? -


i new rdf. have foaffriends.rdf file in working directory. need import , use named graph store in tdb model rather unnamed model , store in external xml file. following code produces blank files. how can fix this? how know uri use?

     string directory = "mydatabases/dataset1" ;      dataset dataset = tdbfactory.createdataset(directory) ;       dataset.begin(readwrite.read) ;        model model = dataset.getnamedmodel("foaffriends.rdf") ;       dataset.commit();        fileoutputstream fout=new fileoutputstream(      "samresult.xml");      model.write(fout);       dataset.end();


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