SessionContents session = new SessionContents(kb);
Session session = new Session(kb);
	public void testPerformance() {		int count = 1000;		Knowledgebase kb = new Knowledgebase();		for (int i = 0; i < count; i++) {			kb.createAttribute(new Enumeration("enum" + i, new String[] { "a", "b", "c", "d" }));		}		for (int i = count-1; i > 0; i--) {			kb.createRule(new Rule(new Equals(kb.getAttribute("enum"+(i-1)), "a"), new AssignEquals(					kb.getAttribute("enum"+(i)), new String[] { "a" })));		}		SessionContents session = new SessionContents(kb);		session.setAttribute("enum0","a");	}