s.set(Signal.PRIORITY, new Integer(1));
    public void transform(Signal s, String l, Item subj, Item p, Model o) throws NullPointerException {        if (s != null) {            s.set(Signal.PRIORITY, new Integer(1));            s.set(Signal.LANGUAGE, l);            s.set(Signal.SUBJECT, subj);            s.set(Signal.PREDICATE, p);            s.set(Signal.OBJECT, o);        } else {            throw new NullPointerException("Could not receive signal. The signal is null.");        }    }