认识
The X Input Method (or XIM) was the original input method framework for the X Window System.
It predates IBus, Fcitx, SCIM, uim and IIIMF. The specification is published most recently in 1994 by (and copyright held by) the X Consortium. Although rarely used today, XIM is historically notable and has been supported in the enterprise products of IBM and Oracle.
组成
The Input Method Protocol | https://www.x.org/releases/X11R7.6/doc/libX11/specs/XIM/xim.html
参考
Wikipedia / X Input Method / https://en.wikipedia.org/wiki/X_Input_Method