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ÎÒÖ»ÊÇÓÃjenaµÄAPIÔÚeclipseÀïÊÔÑé¹ý¼òµ¥µÄÍÆÀí£¬²»ÖªÊÇ·ñÊÇÄãËù˵µÄʹÓÃjenaÍÆÀí»ú¡£Ò»¸öСʾÀýº¯ÊýÈçÏ£º  /**   * infer using jena rules   *   */  public static void inferWithRule() {   // rule:   String ruleStr = "[rule1: (?a http://www.tseg.owl#payFor ?b) ,(?c http://www.tseg.owl#hasBill ?b) -> (?c http://www.tseg.owl#hasAccount ?a)]";   Reasoner reasoner = new GenericRuleReasoner(Rule.parseRules(ruleStr));   reasoner.setDerivationLogging(true);   Model emptyModel = ModelFactory.createDefaultModel();   InfModel inf = ModelFactory.createInfModel(reasoner, emptyModel);   String file = "file:owl/customer_en.owl";   inf.read(file);// print("namespace:"+inf.getNsPrefixURI("")); //to print reasoning track   PrintWriter out = new PrintWriter(System.out   for (StmtIterator i = inf.listStatements(); i.hasNext();) {    Statement s = i.nextStatement();    // System.out.println("Statement is " + s);    for (Iterator id = inf.getDerivation(s); id.hasNext();) {     System.out.println("Statement is " + s);     Derivation deriv = (Derivation) id.next();     deriv.printTrace(out, true);    }   }   out.flush();   // Model inf = FileManager.get().loadModel(file);   /* ²éѯÓï¾ä ,´Ëʱ²éѯÄܲé³ö¼ÓÈë¹æÔòºóÍƳöÀ´µÄÒþº¬¹Øϵ*/   String queryString = "PREFIX ns:<http://www.tseg.owl#> "     + "SELECT ?user ?account "     + "WHERE {?user ns:hasAccount ?account} ";   query(queryString, inf);  }  public static void query(String queryString, Model model) {   Query query = QueryFactory.create(queryString);   QueryExecution qe = QueryExecutionFactory.create(query, model);   ResultSet results = qe.execSelect();   /* ´òÓ¡½á¹û */   ResultSetFormatter.out(System.out, results, query);   qe.close();  }

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