w.write("BEGIN:VCALENDAR\n");
w.write("BEGIN:VCALENDAR"); w.write(LINE_BREAK);
        public void toICalendar(Writer w) throws IOException {            w.write("BEGIN:VCALENDAR\n");            for (ZProperty prop : mProperties)                prop.toICalendar(w);                        for (ZComponent comp : mComponents)                comp.toICalendar(w);            w.write("END:VCALENDAR");        }