Many European layouts have an additional levels accessed with the
AltGr (alternate graphic) modifier, which is not present in U.S. layouts.
compat
Configures compatibility handling for programs that are not aware of the XKB
extension. By now, almost all programs in widespread use are XKB-aware.
symbols
Defines the key symbol produced by the current keyboard state (a combination
of group, modifiers, and preceding keystrokes) and current keystroke.
geometry
Describes the physical layout of the keyboard. This information may be used to
draw a picture of the keyboard for documentation or an on-screen representation
of the keyboard (which is useful for a very few applications such as typing
tutorials). The geometry information is used by very few clients.
12.4
12.4 Selecting an XKB Keymap Using Rules 163
Each component is specified by a filename or by a filename followed by a section name
in parentheses. For example, the default keymap for the X.org server is defined as:
keycodes: xfree86+aliases(qwerty)
types: complete
compat: complete
symbols: pc(pc105)+latin
geometry: pc(pc105)
It??™s really tedious to determine which component values should be used, so XKB provides
a rule-based system (Section 12.
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