sub format {
  return [
           [Version1               => [1, 'C',      '%u', undef, 'checkString']],
           [Version1String         => [0, 'a*',     '%s', undef, 'chompString']],
           [Version2               => [1, 'C',      '%u', undef, 'checkString']],
           [Version2String         => [0, 'a*',     '%s', undef, 'chompString']],
         ];
}