public static function ASFIndexObjectIndexTypeLookup($id) {
    static $ASFIndexObjectIndexTypeLookup = array();
    if (empty($ASFIndexObjectIndexTypeLookup)) {
      $ASFIndexObjectIndexTypeLookup[1] = 'Nearest Past Data Packet';
      $ASFIndexObjectIndexTypeLookup[2] = 'Nearest Past Media Object';
      $ASFIndexObjectIndexTypeLookup[3] = 'Nearest Past Cleanpoint';
    }
    return (isset($ASFIndexObjectIndexTypeLookup[$id]) ? $ASFIndexObjectIndexTypeLookup[$id] : 'invalid');
  }