[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.

;; [CITE@en[RFC 3536 - Terminology Used in Internationalization in the IETF]] ([TIME[2011-01-29 02:14:52 +09:00]] 版) <http://tools.ietf.org/html/rfc3536#page-6>


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