[1] 変域がオクテット列の集合であり、値域が文字レパートリ中の文字列の集合である関数。すなわち、オクテット列と文字符号化方式が文字列を決定する。 (RFC1866, ISO‐HTML http://purl.org/NET/ISO+IEC.15445/15445.html#DEFS 4.3 参照。)

[3]

A character encoding scheme (CES) is a character encoding form plus byte serialization. There are many character encoding schemes in Unicode, such as UTF-8 and UTF-16. <UNICODE>
Some CESs are associated with a single CCS; for example, UTF-8 [RFC2279] applies only to ISO/IEC 10646. Other CESs, such as ISO 2022, are associated with many CCSs.

RFC 3536 - Terminology Used in Internationalization in the IETF (2011-01-29 02:14:52 +09:00 版) http://tools.ietf.org/html/rfc3536#page-6

[4] RFC 6365 - Terminology Used in Internationalization in the IETF (2011-09-10 19:11:51 +09:00 版) http://tools.ietf.org/html/rfc6365#page-8

[5]

A Character Encoding Scheme (CES) is a mapping from a Coded Character Set or several coded character sets to a set of octets. Examples of Character Encoding Schemes are ISO 2022 [ISO-2022] and UTF-8 [UTF-8]. A given CES is typically associated with a single CCS; for example, UTF-8 applies only to ISO 10646.

RFC 2130 - The Report of the IAB Character Set Workshop held 29 February - 1 March, 1996 (2011-09-04 12:12:00 +09:00 版) http://tools.ietf.org/html/rfc2130#page-8

[6] Character Model for the World Wide Web 1.0: Fundamentals ( (2005-02-15 14:24:00 +09:00 版)) http://www.w3.org/TR/charmod/#def-CES