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-The core protocol interpretation of keyboard modifiers does not include direct
-support for multiple keyboard groups, so XKB reports the effective keyboard
-group to XKB-aware clients using some of reserved bits in the state field of
-some core protocol events. This modified state field would not be interpreted
-correctly by XKB-unaware clients, so XKB provides a group compatibility mapping
-which remaps the keyboard group into a core modifier mask that has similar
-effects, when possible.
-
-XKB maintains three compatibility state components that are used to make
-XKB-unaware clients(*) work as well as possible:
-- The compatibility state which corresponds to the effective modifier and
- effective group state.
-- The compatibility lookup state which is the core-protocol equivalent of the
- lookup state.
-- The compatibility grab state which is the nearest core-protocol equivalent
- of the grab state.
-
-Compatibility state are essentially the corresponding XKB states, but with
-keyboard group possibly encoded as one or more modifiers.
-
-Modifiers that correspond to each keyboard group are described in this
-group compatibility map.
-
-
-----
-(*) The implementation of XKB invisibly extends the X library to use the
-keyboard extension if it is present. That means, clients that use library or
-toolkit routines to interpret keyboard events automatically use all of XKB
-features; clients that directly interpret the state field of core protocol
-events or the keymap direcly may be affected by some of the XKB differences.
-Thus most clients can take all advantages without modification but it also
-means that XKB state can be reported to clients that have not explicitly
-requested the keyboard extension.