rfc1642.ps

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gS 0 0 552 730 rC
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-.014(Network Working Group)A
442 50 :M
-.03(D. Goldsmith)A
41 62 :M
-.039(Request for Comments: 1642)A
462 62 :M
-.094(M. Davis)A
41 74 :M
-.045(Category: Experimental)A
443 74 :M
-.023(Taligent, Inc.)A
460 86 :M
(July 1994)S
249 115 :M
f1_18 sf
-.246(UTF-7)A
130 147 :M
f1_14 sf
-.007(A Mail-Safe Transformation Format of Unicode)A
41 176 :M
-.019(Status of this Memo)A
58 204 :M
f0_12 sf
-.006(This memo defines an Experimental Protocol for the Internet community. This memo does)A
58 216 :M
-.003(not specify an Internet standard of any kind. Distribution of this memo is unlimited.)A
41 247 :M
f1_14 sf
-.011(Abstract)A
58 275 :M
f0_12 sf
-.006(The Unicode Standard, version 1.1, and ISO/IEC 10646-1:1993\(E\) jointly define a 16 bit)A
58 287 :M
-.005(character set \(hereafter referred to as Unicode\) which encompasses most of the world\325s)A
58 299 :M
-.006(writing systems. However, Internet mail \(STD 11, RFC 822\) currently supports only 7-bit)A
58 311 :M
-.003(US ASCII as a character set. MIME\312\(RFC 1521 and RFC 1522\) extends Internet mail to)A
58 323 :M
-.006(support different media types and character sets, and thus could support Unicode in mail)A
58 335 :M
-.005(messages. MIME neither defines Unicode as a permitted character set nor specifies how it)A
58 347 :M
-.009(would be encoded, although it does provide for the registration of additional character sets)A
58 359 :M
-.072(over time.)A
58 387 :M
-.01(This document describes a new transformation format of Unicode that contains only 7-bit)A
58 399 :M
-.006(ASCII characters and is intended to be readable by humans in the limiting case that the)A
58 411 :M
-.009(document consists of characters from the US-ASCII repertoire. It also specifies how this)A
58 423 :M
-.007(transformation format is used in the context of RFC 1521, RFC 1522, and the document)A
58 435 :M
-.038(\322Using Unicode with MIME\323.)A
41 466 :M
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-.01(Motivation)A
58 494 :M
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-.002(Although other transformation formats of Unicode exist and could conceivably be used in)A
58 506 :M
-.007(this context \(most notably UTF-1 and UTF-8, also known as UTF-2 or UTF-FSS\), they)A
58 518 :M
-.002(suffer the disadvantage that they use octets in the range decimal 128 through 255 to encode)A
58 530 :M
-.009(Unicode characters outside the US-ASCII range. Thus, in the context of mail, those octets)A
58 542 :M
-.01(must themselves be encoded. This requires putting text through two successive encoding)A
58 554 :M
-.002(processes, and leads to a significant expansion of characters outside the US-ASCII range,)A
58 566 :M
-.002(putting non-English speakers at a disadvantage. For example, using UTF-FSS together with)A
58 578 :M
-.001(the Quoted-Printable content transfer encoding of MIME represents US-ASCII characters in)A
58 590 :M
-.014(one octet, but other characters may require up to nine octets.)A
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-.075(Overview)A
58 107 :M
f0_12 sf
-.002(UTF-7 encodes Unicode characters as US-ASCII, together with shift sequences to encode)A
58 119 :M
-.002(characters outside that range. For this purpose, one of the characters in the US-ASCII)A
58 131 :M
-.016(repertoire is reserved for use as a shift character.)A
58 159 :M
-.006(Many mail gateways and systems cannot handle the entire US-ASCII character set \(those)A
58 171 :M
-.002(based on EBCDIC, for example\), and so UTF-7 contains provisions for encoding characters)A
58 183 :M
-.004(within US-ASCII in a way that all mail systems can accomodate.)A
58 211 :M
-.007(UTF-7 should normally be used only in the context of 7 bit transports, such as mail and)A
58 223 :M
-.008(news. In other contexts, straight Unicode or UTF-8 is preferred.)A
58 251 :M
-.01(See the document \322Using Unicode with MIME\323\312for the overall specification on usage of)A