All, I have another problem with my SPARQL Endpoint servlet, which is just supposed to generate RDF/XML-ABBREV from a query.
The code is the same as with my previous problem, but the current problem is that some of the classes, i.e. the rdf:type triples are lost when serializing. A test query looks like this: PREFIX dct: <http://purl.org/dc/terms/> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> DESCRIBE ?resource ?rest WHERE { ?resource dct:identifier <http://rabbit.computas.int:8180/sublima-webapp-1.0-SNAPSHOT/resource/vi_tidiga__foedd_foer_tidigt_004314> . ?resource ?p ?rest . } If I go directly at the Virtuoso endpoint, I see that the triples are there, but if I use my RDF/XML-ABBREV based endpoint the triples that have ?rest as subject are lost. This is the code, and there is a note further down...: > The core of my servlet code is this: > VirtGraph vGraph = new VirtGraph( > SettingsService.getProperty("sublima.database.url"), > SettingsService.getProperty("sublima.database.username"), > SettingsService.getProperty("sublima.database.password") > ); > Query sparql = null; > try { > sparql = > QueryFactory.create(req.getParameterValues("query")[0]); } catch > (QueryException e) { > res.sendError(400, "The SPARQL query was malformed: " + > e.getMessage()); > e.printStackTrace(); > return; > } > VirtuosoQueryExecution exec = > VirtuosoQueryExecutionFactory.create(sparql, vGraph); > Model model = exec.execDescribe(); I've checked, and the triples are present in this model, so they seem to be lost in the subsequent serialisation. I suppose that the the model is Virtuoso-code, whereas the serialisation itself is Jena, so where does this most likely go wrong? This is the rest of the code: > res.setContentType("application/rdf+xml"); > PrintWriter out = res.getWriter(); > model.write(out, "RDF/XML-ABBREV"); > out.close(); Kind regards Kjetil Kjernsmo -- Senior Knowledge Engineer Mobile: +47 986 48 234 Email: kjetil.kjern...@computas.com Web: http://www.computas.com/ | SHARE YOUR KNOWLEDGE | Computas AS PO Box 482, N-1327 Lysaker | Phone:+47 6783 1000 | Fax:+47 6783 1001
