netcdf tst_enum_undef {
types:
  ubyte enum cloud_class_t {Cumulonimbus = 1, Stratus = 2, Stratocumulus = 3, 
      Cumulus = 4, Altostratus = 5, Nimbostratus = 6, Altocumulus = 7, 
      Cirrostratus = 8, Cirrocumulus = 9, Cirrus = 10, Missing = 255} ;
dimensions:
	station = 5 ;
variables:
	cloud_class_t primary_cloud(station) ;
data:

 primary_cloud = _UNDEFINED, Stratus, _UNDEFINED, Cumulonimbus, Missing ;
}