RECORDTYPE = rtype

  rtype  Is a character scalar memory reference that is
         assigned one of the following values:

  'FIXED'       If the file is open for fixed-length records
  'VARIABLE'    If the file is open for variable-length records
  'SEGMENTED'   If the file is open for unformatted sequential
                I/O using segmented records
  'STREAM'      If the file's records are not terminated
  'STREAM_CR'   If the file's records are terminated with a
                carriage-return
  'STREAM_LF'   If the file's records are terminated with a
                line-feed
  'UNKNOWN'     If the processor cannot determine the record type
                or the file is not open