Title: Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures
Author(s): N. Freed, J. Klensin, J. Postel.
Status: BEST CURRENT PRACTICE
Date: Nov 1996
Length: 45033
Obsoletes: RFC1521, RFC1522, RFC1590
Updated by: RFC3023
STD 11, RFC822, 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 RFC934, STD 11, and RFC1049, but extends and revises them. Because RFC822 said so little about message bodies, these documents are largely orthogonal to (rather than a revision of) RFC822. This fourth document, RFC2048, 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 RFC1521 and RFC1521, which themselves were revisions of RFC1341 and RFC1341. An appendix in RFC2049 describes differences and changes from previous versions.
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