-;; (define-prefix-command 'describe-chinese-environment-map)
-;; (define-key-after describe-language-environment-map [Chinese]
-;; '("Chinese" . describe-chinese-environment-map)
-;; t)
+;; (make-coding-system
+;; 'iso-2022-cn-ext 2 ?C
+;; "ISO 2022 based 7bit encoding for Chinese GB and CNS (MIME:ISO-2022-CN-EXT)"
+;; '(ascii
+;; (nil chinese-gb2312 chinese-cns11643-1)
+;; (nil chinese-cns11643-2)
+;; (nil chinese-cns11643-3 chinese-cns11643-4 chinese-cns11643-5
+;; chinese-cns11643-6 chinese-cns11643-7)
+;; nil ascii-eol ascii-cntl seven locking-shift single-shift nil nil nil
+;; init-bol)
+;; '((safe-charsets ascii chinese-gb2312 chinese-cns11643-1 chinese-cns11643-2
+;; chinese-cns11643-3 chinese-cns11643-4 chinese-cns11643-5
+;; chinese-cns11643-6 chinese-cns11643-7)
+;; (mime-charset . iso-2022-cn-ext)))