On 11/06/13 16:06, Andy Seaborne wrote:
On 10/06/13 21:52, Cindy A McMullen wrote:
I'm using the in-memory Jena implementation (not TDB). How do I
query across the union of named graphs?
Union of named graphs is really a feature of the storage and not as
uniformly treated as I would like.
For an in-memory dataset, this works:
Graph g = GraphView.createNamedGraph(dsg, Quad.unionGraph) ;
Model m = ModelFactory.createModelForGraph(g) ;
If you are using a DatasetGraph.createMem, this works:
Dataset ds = DatasetFactory.createMem() ;
Graph g = GraphView.createNamedGraph(dsg, Quad.unionGraph) ;
Model m = ModelFactory.createModelForGraph(g) ;
ds.setDefaultModel(m) ;
although you don't have the original default model around anymore.
(latest version)
It'll work on on any dataset, maybe not optimally though (but not bad
either).
Andy
