quail-install-decode-map
quail-install-decode-map is an autoloaded Lisp function in `quail.el
'.
(quail-install-decode-map DECODE-MAP &optional NAME)
Install the Quail decode map DECODE-MAP in the current Quail package.
Optional 2nd arg NAME, if non-nil, is a name of Quail package for
which to install MAP.
The installed decode map can be referred by the function `quail-decode-map'.