I'm looking for dynamic inference based on the select. Given a dataset with multiple named graphs I would like the ability to wrap specific named graphs based on some form of filter when the select is processed.
Given the dataset D which contains the named graphs G1, G2, G3 I would like G2 to be returned with RDFS inference if it is queried in a select. I have achieved this by wrapping the graph as an InfModel and using a DatasetGraphMap but this requires that the graph be known before the select is executed. What I'm trying to find (if it exists) is the point during the select processing when the graph is identified and used? Does this exist in a TDB Dataset or is it just a set of quads? Dick. On 18 June 2013 16:01, Andy Seaborne <[email protected]> wrote: > Dick, > > I'm not completely sure what you're trying to do - a complete minimal > example showing how they bits and pieces fit together would be good. It > seems to be querying the dataset without the inference graph. I don't see > where you query the dataset (and which one) > > > if (graphNode.getURI().equals(**types.getURI())) { > > if (graphNode.equals(types.**asNode()) { > > > > On 18/06/13 14:22, Dick Murray wrote: > >> Hi. >> >> Is it possible to get at the graph i.e. the ?g (specifically the returned >> nodes) when the following query is executed? >> > > Yes - getGraph / getNamedModel depending on which level your working at. > > > SELECT * >> WHERE >> { { ?g >> <http://www.w3.org/1999/02/22-**rdf-syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>> >> < >> http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>> >> } >> GRAPH ?g >> { ?s ?p ?o } >> } >> >> When the result is instantiated I want to return the ?g as an RDFS >> infmodel. Ideally I want to decide what to return based on the ?g. I've >> traced the execSelect() and the ResultSetMem() but drew a blank as to >> where >> I can get at the ?g's! >> > > ResultSet.next().getResource("**g") ; > or > ResultSet.nextBinding().get(**Var.alloc("g")) ; > > > > >> The following allows me to wrap the returned graph but this is static i.e. >> I need to know the ?g's to generate the dgm to pass to the >> QueryExecutionFactory. >> >> dataset.begin(ReadWrite.READ); >> DatasetGraphMap dgm = new DatasetGraphMap(dataset.**asDatasetGraph()) { >> >> @Override >> public Graph getGraph(Node graphNode) { >> Graph g = super.getGraph(graphNode); >> if (graphNode.getURI().equals(**types.getURI())) { >> g = asRDFS(g); >> } >> return g; >> } >> public Graph asRDFS(Graph g) { >> return >> ModelFactory.createRDFSModel(**ModelFactory.**createModelForGraph(g)).** >> getGraph(); >> } >> }; >> Graph g = dgm.getGraph(types.asNode()); >> info(g.size()); >> dataset.end(); >> >> For the following triples loaded in the default graph; >> >> @prefix rdf: >> <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> >. >> @prefix rdfs: >> <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#> >> >. >> >> @prefix graph: >> <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#> >> >. >> >> @prefix graphs: >> <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/> >> >. >> >> graph:Graph >> rdf:type rdfs:Class. >> graphs:g1 >> rdf:type graph:Graph. >> >> and these loaded in a named graph >> <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1> >> >; >> >> @prefix rdf: >> <http://www.w3.org/1999/02/22-**rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> >. >> @prefix rdfs: >> <http://www.w3.org/2000/01/**rdf-schema#<http://www.w3.org/2000/01/rdf-schema#> >> >. >> >> @prefix graph: >> <http://www.unit4.com/daas/**graph#<http://www.unit4.com/daas/graph#> >> >. >> >> @prefix graphs: >> <http://www.unit4.com/daas/**graphs/<http://www.unit4.com/daas/graphs/> >> >. >> >> graphs:g1 >> rdfs:label "Graph 1". >> >> A select returns; >> >> select * where {{ ?g a >> <http://www.unit4.com/daas/**graph#Graph<http://www.unit4.com/daas/graph#Graph>> >> }. graph ?g >> {?s ?p ?o}} >> ------------------------------**------------------------------** >> ------------------------------**------------------------------** >> -------------------- >> | g | s >> | p | o | >> ==============================**==============================** >> ==============================**==============================** >> ==================== >> | >> <http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>> >> | < >> http://www.unit4.com/daas/**graphs/g1<http://www.unit4.com/daas/graphs/g1>> >> | < >> http://www.w3.org/2000/01/rdf-**schema#label<http://www.w3.org/2000/01/rdf-schema#label>> >> | "Graph 1" | >> ------------------------------**------------------------------** >> ------------------------------**------------------------------** >> -------------------- >> >> What I want is for it to return about 40 more... :-) >> >> >
