RFC 1895 (rfc1895) - Page 2 of 6

The Application/CALS-1840 Content-type

RFC 1895                       CALS-1840                   February 1996


   records immediately followed by the data.  The data itself may be
   formatted in accordance with a published specification or a
   contractual agreement.

   MIL-STD-1840 encodes the file's data type in the file name.

   It might seem appropriate to transform the 1840 headers into MIME
   headers and use the appropriate media type, essentially transforming
   the 1840 files into MIME body parts.  There are three reasons for not
   doing that.  First, not all of the "types" used in [1840] are
   registered MIME types.  Second, there exists an installed base of
   software capable of reading the 1840 formatted files and processing
   the data appropriately.  Finally the three existing revisions to the
   standard have maintained the same file structure.  Consequently, a
   processor for the data may be able to handle any one of the
   standard's revisions.  Thus, a single Application/CALS-1840 is being
   proposed and its body part body contains headers and data in the
   [1840] format.

   A set of related files constitutes a "transfer unit" in 1840 and each
   transfer unit shall correspond to a Multipart/Mixed MIME entity.
   Included in each transfer unit is a declaration file which shall be
   the first body part in the Multipart/Mixed entity.  Several transfer
   units may be included in a single MIME message.



























Levinson                     Informational