Title: UTF-7 A Mail-Safe Transformation Format of Unicode
Author(s): D. Goldsmith, M. Davis.
Status: INFORMATIONAL
Date: May 1997
Length: 28065
Obsoletes: RFC1642
The Unicode Standard, version 2.0, and ISO/IEC 10646-1:1993(E) (as amended) jointly define a character set (hereafter referred to as Unicode) which encompasses most of the world's writing systems. However, Internet mail (STD 11, RFC822) currently supports only 7- bit US ASCII as a character set. MIME (RFC2045 through 2049) extends Internet mail to support different media types and character sets, and thus could support Unicode in mail messages. MIME neither defines Unicode as a permitted character set nor specifies how it would be encoded, although it does provide for the registration of additional character sets over time.
This document describes a transformation format of Unicode that contains only 7-bit ASCII octets and is intended to be readable by humans in the limiting case that the document consists of characters from the US-ASCII repertoire. It also specifies how this transformation format is used in the context of MIME and RFC1641, "Using Unicode with MIME".
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