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Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures (RFC2048)

IP.com Disclosure Number: IPCOM000004275D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2019-Feb-16
Document File: 21 page(s) / 28K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Freed: AUTHOR [+2]

Related Documents

10.17487/RFC2048: DOI

Abstract

This set of documents, collectively called the Multipurpose Internet Mail Extensions, or MIME, redefines the format of messages. This fourth document, RFC 2048, specifies various IANA registration procedures for some MIME facilities. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

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This is the abbreviated version, containing approximately 8% of the total text.

Network Working Group N. Freed Request for Comments: 2048 Innosoft BCP: 13 J. Klensin Obsoletes: 1521, 1522, 1590 MCI Category: Best Current Practice J. Postel ISI November 1996

Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures

Status of this Memo

This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited.

Abstract

STD 11, RFC 822, defines a message representation protocol specifying considerable detail about US-ASCII message headers, and leaves the message content, or message body, as flat US-ASCII text. This set of documents, collectively called the Multipurpose Internet Mail Extensions, or MIME, redefines the format of messages to allow for

(1) textual message bodies in character sets other than US-ASCII,

(2) an extensible set of different formats for non-textual message bodies,

(3) multi-part message bodies, and

(4) textual header information in character sets other than US-ASCII.

These documents are based on earlier work documented in RFC 934, STD 11, and RFC 1049, but extends and revises them. Because RFC 822 said so little about message bodies, these documents are largely orthogonal to (rather than a revision of) RFC 822.

Freed, et. al. Best Current Practice [Page 1]

RFC 2048 MIME Registration Procedures November 1996

This fourth document, RFC 2048, specifies various IANA registration procedures for the following MIME facilities:

(1) media types,

(2) external body access types,

(3) content-transfer-encodings.

Registration of character sets for use in MIME is covered elsewhere and is no longer addressed by this document.

These documents are revisions of RFCs 1521 and 1522, which themselves were revisions of RFCs 1341 and 1342. An appendix in RFC 2049 describes differences and changes from previous versions.

Table of Contents

1. Introduction ......................................... 3 2. Media Type Registration .............................. 4 2.1 Registration Trees and Subtype Names ................ 4 2.1.1 IETF Tree ......................................... 4 2.1.2 Vendor Tree ....................................... 4 2.1.3 Personal or Vanity Tree ........................... 5 2.1.4 Special ‘x.’ Tree ................................. 5 2.1.5 Additional Registration Trees ..................... 6 2.2 Registration Requirements ........................... 6 2.2.1 Functionality Requirement ......................... 6 2.2.2 Naming Requirements ............................... 6 2.2.3 Parameter Requirements ............................ 7 2.2.4 Canonicalization and Format Requirements .......... 7 2.2.5 Interchange Recommendations ....................... 8 2.2.6 Security Requirements ............................. 8 2.2.7 Usage and Implementation Non-requirements ......... 9 2.2.8 Publication Requirements .......................... 10 2.2.9 Additional Information ............................ 1...

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