private void trace(Object value, boolean match, int next) { System.out.println(
private String trace(Object value, boolean match, int next) { return
	private void trace(Object value, boolean match, int next) {	    System.out.println(                "NODE " + getFeature() + " ["		+ value + "] " 		+ comparisonType + " ["                 + getValue() + "] "		+ (match ? "Yes" : "No") + " next " +		    next);	}