Network Working Group                                    H. Alvestrand
Request for Comments: 2160                                     UNINETT
Category: Standards Track                                 January 1998

Carrying PostScript in X.400 and MIME

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   1 Introduction ............................................    1
   2 The PostScript body part ................................    1
   3 The PostScript FTBP .....................................    2
   4 The Application/PostScript content-type .................    2
   5 MIXER conversion ........................................    2
   6 MIXER conversion ........................................    2
   7 OID Assignments .........................................    3
   8 Security Issues .........................................    3
   9 Trademark Issues ........................................    3
   10 References .............................................    3
   11 Author's Address .......................................    4
   12 Full Copyright Statement ...............................    5

1. Introduction

   This document describes methods for carrying PostScript information
   in the two standard mail systems MIME and X.400, and the conversion
   between them. It uses the notational conventions of [BODYMAP], and
   the conversion is further described in [MIXER].

   Two ways of carrying PostScript in X.400 are described.  One is using
   the FTAM Body Part, and one uses the Extended Body Part originally
   described in RFC 1494.

   The FTAM method is recommended.

2. The PostScript body part

   Carrying PostScript in X.400 as an Extended Body Part was originally
   defined in RFC 1494.  This specification carries that work forward
   now that RFC 1494 is obsoleted by [BODYMAP].

   The following Extended Body Part is defined for PostScript data
   streams.  It has no parameters.

      postscript-body-part EXTENDED-BODY-PART-TYPE
        DATA             OCTET STRING
        ::= mime-postscript-body

      mime-postscript-body OBJECT IDENTIFIER ::=
                { mixer-bp-data 2 }

3. The PostScript FTBP

   The PostScript FTBP is identified by having the
   FileTransferParameters.environment.application-reference set to id-
   mime-ftbp-postscript.

   The definition is:

    id-mime-ftbp-postscript OBJECT IDENTIFIER ::=
                       { mixer-bp-data 6 }

4. The Application/PostScript content-type

In MIME, PostScript is carried in the body part
"application/PostScript", which is defined in RFC 1521.

5. MIXER conversion

X.400 Body Part: Extended Body Part, OID mime-postscript-body MIME
Content-Type: application/postscript Conversion Type: No conversion

   The two representations of PostScript both contain a single stream of
   octets. This stream of octets can be copied with no problems between
   the representations. No other data needs to be converted.

6. MIXER conversion

X.400 Body Part: FTBP, OID mime-ftbp-postscript-body MIME Content-
Type: application/postscript Conversion Type: No conversion

   The two representations of PostScript both contain a single stream of
   octets. This stream of octets can be copied with no problems between
   the representations. No other data needs to be converted.

7. OID Assignments

   The first OID is also defined in [BODYMAP].

    POSTSCRIPT-MAPPINGS DEFINITIONS ::= BEGIN
    EXPORTS -- everything --;

    IMPORTS
       mixer-bp-data
           FROM MIXER-MAPPINGS

    id-mime-postscript-body OBJECT IDENTIFIER ::=
            { mixer-bp-data 2 };
    id-mime-ftbp-postscript OBJECT IDENTIFIER ::=
            { mixer-bp-data 6 };

    END

8. Security Issues

The issues concerning PostScript and security are well discussed in
RFC 2046. No additional security issues are identified by this memo.

9. Trademark Issues

PostScript is a trademark of Adobe Systems, Inc.

10. References

[MIXER]
     Kille, S., "MIXER: Mapping between X.400
     and RFC 822/MIME", RFC 2156, January 1998.

[BODYMAP]
     Alvestrand, H., "Mapping between X.400 and RFC 822/MIME
     Message Bodies", RFC 2157, January 1998.

11. Author's Address

   Harald Tveit Alvestrand
   UNINETT
   Postboks 6883 Elgeseter
   N-7002 TRONDHEIM

   Phone: +47 73 59 70 94
   EMail: Harald.T.Alvestrand@uninett.no

12. Full Copyright Statement

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

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   The limited permissions granted above are perpetual and will not be
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