property of a coding system.
;; ENCODING-FUNCTION is a function to encode a character in CHARSET
;; to the code in EXTERNAL-CHARSET-NAME. The command what-cursor-position
;; uses this information of the buffer-file-coding-system.
+;; ENCODING-FUNCTION may be a translation table or a symbol whose
+;; property `translation-table' is a translation table. In these case,
+;; the translation table is used to encode the character.
;;
;; o valid-codes (meaningful only for a coding system based on CCL)
;;