Equivalences between 1988 X.400 and RFC-822 Message Bodies
RFC 1494

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• 02

Network Working Group                                      H. Alvestrand
Request for Comments: 1494                                  SINTEF DELAB
                                                             S. Thompson
                                                       Soft*Switch, Inc.
                                                             August 1993

       Equivalences between 1988 X.400 and RFC-822 Message Bodies

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Table of Contents

   1.  Introduction .............................................    2
   2.  Equivalence Table Definition .............................    2
   3.  Generic conversions ......................................    3
   3.1.  Byte copy ..............................................    3
   3.2.  Text Conversion ........................................    3
   3.3.  Image Conversion .......................................    3
   3.4.  Tunneling ..............................................    3
   4.  Conversion Table for known X.400 and MIME  Types .........    4
   4.1.  MIME to X.400 Table ....................................    4
   4.2.  X.400 to MIME Table ....................................    4
   5.  Newly defined X.400 Body Parts ...........................    5
   5.1.  Use of OBJECT IDENTIFIERs and ASN.1 MACROS .............    5
   5.2.  The Generic MIME Extended Body Part ....................    6
   5.3.  The PostScript body part ...............................    7
   5.4.  The JPEG body part .....................................    7
   5.5.  The GIF body part ......................................    8
   6.  Newly defined MIME content-types .........................    8
   6.1.  The application/x400-bp content-type ...................    8
   6.2.  The image/g3fax content-type ...........................    9
   6.2.1.  G3Fax Parameters .....................................    9
   6.2.2.  Content Encoding .....................................   10
   6.3.  The Application/ODA content-type .......................   11
   7. Equivalence Definitions ...................................   11
   7.1. IA5Text - text/plain ....................................   11
   7.2. GeneralText - text/plain (ISO-8859) .....................   12
   7.3. BilaterallyDefined -  application/octet-stream ..........   13
   7.4. ODA - application/oda ...................................   14
   7.5. g3-facsimile - image/g3fax ..............................   15
   7.6. application/postscript -  postscript-body-part ..........   16
   7.7. application/jpeg - jpeg-body-part .......................   16

Alvestrand & Thompson                                           [Page 1]
RFC 1494              X.400/MIME Body Equivalences           August 1993

   7.8. image/gif - gif-body-part ...............................   16
   8. OID Assignments ...........................................   17
   9. IANA Registration form for new mappings ...................   17
   10. Security Considerations ..................................   18
   11. Authors' Addresses .......................................   18
   12. References ...............................................   19

1.  Introduction

   This document is a companion to [1], which defines the principles
   behind interworking between MIME-based RFC-822 mail and X.400 mail.
   This document describes the content of the "IANA MHS/MIME Equivalence
   table" referenced in the companion document, and defines the initial
   configuration of this table.  Mappings for new MIME content-types
   and/or X.400 body part types should be registered with the IANA to
   minimize redundancy and promote interoperability.

   In MIME, the term "content-type" is used to refer to an information
   object contained in the body of a message.  In contrast, X.400 uses
   the term "body part type."  In this document, the term "body part" is
   used to refer to either.

   Please send comments to the MIME-MHS mailing list:
   <mime-mhs@surfnet.nl>.

2.  Equivalence Table Definition

   For each MIME content-type/X.400 body part pair, the Equivalence
   Table will contain an entry with the following sections:

   X.400 Body Part
        This section identifies the X.400 Body Part governed by this
        Table entry. It includes any OBJECT IDENTIFIERs or other
        parameters necessary to uniquely identify the Body Part.

   MIME Content-Type
        This section identifies the MIME content-type governed by this
        Table entry.  The MIME content-type named here must be
        registered with the IANA.

   Conversion Type
        This section identifies the type of conversion applied.  See the