private Object handleTitl(Object tos) {
      if ((tos instanceof Media && ((Media)tos).getTitle() == null) ||
          (tos instanceof Source && ((Source)tos).getTitle() == null)) {
         return new FieldRef(tos, "Title");
      }
      else if (tos instanceof Person) {
         Name name = new Name();
         name.setType("TITL");
         ((Person)tos).addName(name);
         return name;
      }
      return null;
   }