Multiple Language Content Type

Document Type Active Internet-Draft (slim WG)
Last updated 2017-06-12
Replaces draft-tomkinson-slim-multilangcontent
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IETF                                                        N. Tomkinson
Internet-Draft                                             N. Borenstein
Intended status: Standards Track                            Mimecast Ltd
Expires: December 14, 2017                                 June 12, 2017

                     Multiple Language Content Type


   This document defines an addition to the Multipurpose Internet Mail
   Extensions (MIME) standard to make it possible to send one message
   that contains multiple language versions of the same information.
   The translations would be identified by a language tag and selected
   by the email client based on a user's language settings.

Status of This Memo

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Tomkinson & Borenstein  Expires December 14, 2017               [Page 1]
Internet-Draft       Multiple Language Content Type            June 2017

1.  Introduction

   Since the invention of email and the rapid spread of the Internet,
   more and more people have been able to communicate in more and more
   countries and in more and more languages.  But during this time of
   technological evolution, email has remained a single-language
   communication tool, whether it is English to English, Spanish to
   Spanish or Japanese to Japanese.

   Also during this time, many corporations have established their
   offices in multi-cultural cities and formed departments and teams
   that span continents, cultures and languages, so the need to
   communicate efficiently with little margin for miscommunication has
   grown significantly.

   The objective of this document is to define an addition to the
   Multipurpose Internet Mail Extensions (MIME) standard, to make it
   possible to send a single message to a group of people in such a way
   that all of the recipients can read the email in their preferred
   language.  The methods of translation of the message content are
   beyond the scope of this document, but the structure of the email
   itself is defined herein.

   Whilst this document depends on identification of language in message
   parts for non-real-time communication, there is a companion document
   that is concerned with a similar problem for real-time communication:

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  The Content-Type Header Field

   The "multipart/multilingual" MIME subtype allows the sending of a
   message in a number of different languages with the translations
   embedded in the same message.  This MIME subtype helps the receiving
   email client make sense of the message structure.

   The multipart subtype "multipart/multilingual" has similar semantics
   to "multipart/alternative" (as discussed in RFC 2046 [RFC2046]) in
   that each of the message parts is an alternative version of the same
   information.  The primary difference between "multipart/multilingual"
   and "multipart/alternative" is that when using "multipart/
   multilingual", the message part to select for rendering is chosen
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