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Character Mnemonics and Character Sets (RFC1345)

IP.com Disclosure Number: IPCOM000002169D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2000-Sep-12

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Simonsen: AUTHOR

Abstract

With the growing internationalization of the Internet, support for many coded character sets is required. It is the intention of this memo to document precisely the mapping between all characters and their corresponding coded representations in various coded character sets, and give names to these coded character sets, so they can be referenced unambiguously in Internet standards.

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Network Working Group K. Simonsen

Request for Comments: 1345 Rationel Almen Planlaegning

June 1992

Character Mnemonics & Character Sets

Status of the Memo

This memo provides information for the Internet community. It does

not specify an Internet standard. Distribution of this memo is

unlimited.

Summary

This memo lists a selection of characters and their presence in some

coded character sets. To facilitate the coded character set

tabulations an unambiguous mnemonic for each character is used, and a

format for tabulating the coded character sets is defined. The coded

character sets are given names for easy reference. A family of coded

character sets called the mnemonic character sets and conversion

between these coded character set without information loss is

defined.

The character set names are registered with the Internet Assigned

Numbers Authority (IANA). Additional character sets not described in

this memo should be registered with the IANA. This memo may be

updated periodically, or additional specifications may be published,

to reflect other coded character sets.

Please send any comments including comments about the accuracy of the

tables to the author, Keld Simonsen .

1. INTRODUCTION

With the growing internationalization of the Internet, support for

many coded character sets is required. It is the intention of this

memo to document precisely the mapping between all characters and

their corresponding coded representations in various coded character

sets, and give names to these coded character sets, so they can be

referenced unambiguously in Internet standards.

This memo does not indicate anything about the validity of using

these specifications in any Internet standard, so you should consult

each individual Internet standard to see which coded character sets

and names are allowed there.

Unambiguous character mnemonics are specified, which provide a

practical way of identifying a character, without reference to a

coded character set and its code in this coded character set. The

mnemonics are written in a minimal set of characters, namely the

invariant 83 graphical characters of ISO 646, which is a kind of

greatest common subset to be found between the majority of coded

character sets, including ASCII, national variants of the ISO 646 7-

bit character set and various EBCDICs. In addition, the numeric

value of the coded representations of all these characters are the

same in all coded character sets compatible with ISO standards. All

of them except two, EXCLAMATION MARK and QUOTATION MARK, have the

same coded representation in all variants of EBCDIC. This minimal

set of characters is called the reference character set in this memo.

The mnemonics can be used in Internet standards for easy and

unambigu...