Hashtable<String, Object> storage = new Hashtable<String, Object>();
storage.put("fhg", new FeedbackHistoryGraph(new FeedbackHistoryEdgeFactory()));
storage.put("et", new EigenTrust());
storage.put("rg", new ReputationGraph(new ReputationEdgeFactory()));
storage.put("as", new Appleseed());
storage.put("rk", new RankbasedTrustAlg());
storage.put("tg", new TrustGraph(new TrustEdgeFactory()));
WorkflowParser2 parser = new WorkflowParser2("rg>as>rg", storage);
System.out.println(parser);