计算JENA中DBPedia的两种资源之间的距离

Question

I'm trying to calculate the distance (number of the edges in the DBpedia'graph) between two resources that I receive after querying DBpedia. For example:

     Query query = QueryFactory.create(sparqlQueryString);
     QueryExecution qexec =QueryExecutionFactory.sparqlService("http://dbpedia.org/sparql",query);

     try{
       ResultSet results = qexec.execSelect();
        for(; results.hasNext();) {
         QuerySolution soln = results.nextSolution();
         for(int i=0;i<solutionConcept.length;i++){
                    System.out.print(solutionConcept[i]+":"+soln.get(solutionConcept[i]).toString() +";  "); 
         }
         System.out.println("\n");
         }
        } finally{
        qexec.close();

and this is the string query:

String s6= "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> "+
             "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> "+
             "PREFIX dbpedia: <http://dbpedia.org/resource/> "+
             "PREFIX o: <http://dbpedia.org/ontology/> "+
             "PREFIX dbprop: <http://dbpedia.org/property/>"+
             "PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" +
             "select ?Player ?nation ?club "+
             "where {?Player rdf:type o:SoccerPlayer; dbprop:birthPlace ?nation; dbprop:currentclub ?club.} LIMIT 10";

well, is there a way to calculate the number of the edges ( the path??) between two players, or two nation , or two club???? Thank you very much...

Answer 1

You wont be able to calculate that distance on the QuerySolution resulting from your current query.

If you want to compute such a semantic distance you have to do it either through another SPARQL query or after updating your query to retrieve needed information locally.