:ELEMENT-TYPE - the type of object to read or write, default BASE-CHAR
:IF-EXISTS - one of :ERROR, :NEW-VERSION, :RENAME, :RENAME-AND-DELETE,
:OVERWRITE, :APPEND, :SUPERSEDE or NIL
- :IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or nil
+ :IF-DOES-NOT-EXIST - one of :ERROR, :CREATE or NIL
See the manual for details."
(unless (eq external-format :default)