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MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations (RFC2184)

IP.com Disclosure Number: IPCOM000002743D
Original Publication Date: 1997-Aug-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 7 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

N. Freed: AUTHOR [+2]

Abstract

This memo defines extensions to the RFC 2045 media type and RFC 2183 disposition parameter value mechanisms to provide

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 18% of the total text.

Network Working Group N. Freed

Request for Comments: 2184 Innosoft

Updates: 2045, 2047, 2183 K. Moore

Category: Standards Track University of Tennessee

August 1997

MIME Parameter Value and Encoded Word Extensions:

Character Sets, Languages, and Continuations

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.

1. Abstract

This memo defines extensions to the RFC 2045 media type and RFC 2183

disposition parameter value mechanisms to provide

(1) a means to specify parameter values in character sets

other than US-ASCII,

(2) to specify the language to be used should the value be

displayed, and

(3) a continuation mechanism for long parameter values to

avoid problems with header line wrapping.

This memo also defines an extension to the encoded words defined in

RFC 2047 to allow the specification of the language to be used for

display as well as the character set.

2. Introduction

The Multipurpose Internet Mail Extensions, or MIME [RFC-2045, RFC-

2046, RFC-2047, RFC-2048, RFC-2049], define a message format that

allows for

(1) textual message bodies in character sets other than

US-ASCII,

(2) non-textual message bodies,

(3) multi-part message bodies, and

(4) textual header information in character sets other than

US-ASCII.

MIME is now widely deployed and is used by a variety of Internet

protocols, including, of course, Internet email. However, MIME's

success has resulted in the need for additional mechanisms that were

not provided in the original protocol specification.

In particular, existing MIME mechanisms provide for named media type

(content-type field) parameters as well as named disposition

(content-disposition field). A MIME media type may specify any

number of parameters associated with all of its subtypes, and any

specific subtype may specify additional parameters for its own use. A

MIME disposition value may specify any number of associated

parameters, the most important of which is probably the attachment

disposition's filename parameter.

These parameter names and values end up appearing in the content-type

and content-disposition header fields in Internet email. This

inherently imposes three crucial limitations:

(1) Lines in Internet email header fields are folded according to

RFC 822 folding rules. This makes long parameter values

problematic.

(2) MIME headers, like the RFC ...