Pretty print turtle output

Author: benjaminaaron

server/src/main/java/org/foerderfunke/sem_ops_server/Converter.java

@@ -1,4 +1,6 @@
 package org.foerderfunke.sem_ops_server;
+import org.apache.jena.riot.RDFDataMgr;
+import org.apache.jena.riot.RDFFormat;
 import org.spinrdf.arq.ARQ2SPIN;
 import org.spinrdf.system.SPINModuleRegistry;
 import org.spinrdf.arq.ARQFactory;
@@ -14,14 +16,16 @@ public void sparqlToSpin() {
         String sparql = "SELECT * WHERE { ?s ?p ?o }";
 
         SPINModuleRegistry.get().init();
-        Model spinModel = ModelFactory.createDefaultModel();
+        Model model = ModelFactory.createDefaultModel();
+        model.setNsPrefix("sp",   "http://spinrdf.org/sp#");
+        model.setNsPrefix("rdf",  "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
 
-        org.apache.jena.query.Query arqQuery = ARQFactory.get().createQuery(spinModel, sparql);
-        ARQ2SPIN converter = new ARQ2SPIN(spinModel);
+        org.apache.jena.query.Query arqQuery = ARQFactory.get().createQuery(model, sparql);
+        ARQ2SPIN converter = new ARQ2SPIN(model);
         org.spinrdf.model.Query spinQuery = converter.createQuery(arqQuery, null);
 
         StringWriter writer = new StringWriter();
-        spinModel.write(writer, "TURTLE");
+        RDFDataMgr.write(writer, model, RDFFormat.TURTLE_PRETTY);
         System.out.println(writer);
     }
 }