throw new ModelException(ERR_DRA + f.getName());
throw new ModelException(E.GROUP_DRA + f.getName());
  protected static void canDelAttribute(Group g, Field f)     throws  InsufficientPrivilegeException,            ModelException,            SchemaException  {    if (f.getRequired()) {      throw new ModelException(ERR_DRA + f.getName());    }    canModAttribute(g, f);  } // protected static void canDelAttribute(g, f, value)