Jena rules

[javed khan]

The first rule here works and save the individual as GoodStudent when marks
is greater than 2 but not assign individual to WorstStudent when marks are
less than 2? Where I am doing mistake here ?



  String rule = "[rule1:(?x http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.semanticweb.org#Student <http://www.semanticweb.org/#Student>) "
                + "( ?x http://www.semanticweb.org#GPA
<http://www.semanticweb.org/#GPA>  ?marks )"
                + "greaterThan(?marks, 2) "
                + " ->  (?x http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.semanticweb.org#GoodStudent
<http://www.semanticweb.org/#GoodStudent> )]";


 String rule = "[rule2:(?y http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.semanticweb.org#Student <http://www.semanticweb.org/#Student>) "
                + "( ?y http://www.semanticweb.org#GPA
<http://www.semanticweb.org/#GPA>  ?marks )"
                + "lessThan(?marks, 2) "
                + " ->  (?y http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.semanticweb.org#WorstStudent
<http://www.semanticweb.org/#GoodStudent> )]";

 "SELECT  * " +
                " WHERE {  ?x rdf:type std:GoodStudent . ?y rdf:type
std:WorstStudent }";

 Reasoner reasoner2 = new GenericRuleReasoner(Rule.parseRules(rule));
        InfModel inf = ModelFactory.createInfModel(reasoner2, model);
             Query query = QueryFactory.create(queryString);

     QueryExecution qe = QueryExecutionFactory.create(query, inf);
     ResultSet results = qe.execSelect();

     ResultSetFormatter.out(System.out, results, query);
     qe.close();

try (FileOutputStream writer = new FileOutputStream("D://std.owl")) {
            inf.write(writer, "RDF/XML");
        } catch (IOException ex) {
            Logger.getLogger(myframe.class.getName()).log(Level.SEVERE,
null, ex);
        }