JenaMongoConnection mc = new JenaMongoConnection("mongodb://localhost:27017");
        JenaMongoStore ms = new JenaMongoStore(mc, "semantic");

        Dataset ds = JenaMongoDataset.create(ms, "semtest1");

mm = ModelFactory.createOntologyModel();
        add(mm, "A", "Item");
        add(mm, "B", "A");
        add(mm, "C", "B");
        ds = DatasetFactory.create(mm);
        QueryExecution qe = QueryExecutionFactory.create(query, ds) ;
        ResultSet rs = qe.execSelect() ;

Graph g = new JenaMongoGraph(various args);
    Model model = ModelFactory.createModelForGraph(g);
Model rdfsModel = ModelFactory.createRDFSModel(model);

    Dataset ds = DatasetFactory.create(rdfsModel);
    // proceed "as normal" from here