The keyboard map can also include a compose key, which is pressed before a twokey
sequence to generate special characters (for example, pressing Compose-/-C
yields the cent symbol [??]; Compose-O-R yields the registered trademark symbol
[?®]; and Compose-comma-C yields a C with cedilla [?‡]).
In these days of international communication, many users need to communicate in
more than one language, so many keymaps have more than one keyboard group
defined, with a key or key combination to temporarily switch or to cycle through the
groups. Each keyboard group corresponds to one layout. Keyboard LEDs (particularly
the ScrollLock LED) may be assigned to indicate the current group.
To load a keymap into the X server, you need to know how to specify that keymap
(Sections 12.3 and 12.4), and you need to know how you can use that specification
in a file or as command arguments (Sections 12.6, 12.7, and 12.8).
12.2
162 Chapter 12: Keyboard Configuration
XKB has a special reputation in the X world for being underdocumented.
This reputation is not wholly deserved??”there are other
components of X that have less documentation??”but for such a
sophisticated system, the documentation is definitely thin.
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