}
    public Object subscriptionChangedObject(IncrementalSubscription sub) {	if (sub.getChangedList().hasMoreElements()){	    return sub.getChangedList().nextElement();	} else if(sub.getAddedList().hasMoreElements()) {	    return sub.getAddedList().nextElement();	} else if(sub.getRemovedList().hasMoreElements()){	    return sub.getRemovedList().nextElement();	} else {	    return null;	}    }