[2]
> A character encoding form is a mapping from a character set
definition to the actual code units used to represent the data. <UNICODE>

;; [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-5>