Source authenticationSource = new SourceImpl("http://localhost/authentication-master#");
store.assertGraph(authenticationSource, new FCAGraphImpl(authenticationModel));
Model authorizationModel = createAuthorizationModel();
Source authorizationSource = new SourceImpl("http://localhost/authorization-master#");
store.assertGraph(authorizationSource, new FCAGraphImpl(authorizationModel));
Set<Source> sources = new HashSet<Source>();
sources.add(authenticationSource);
sources.add(authorizationSource);
GraphOverTime configGOT = store.getGraphOverTime(sources );