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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 the 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 states are essentially the corresponding XKB states, but with
the 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's
features; clients that directly interpret the state field of core-protocol
events or the keymap directly 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.

 Name                                                              Last modified      Size  
 Parent Directory                                                                       -   
 CVS/                                                              19-Mar-2020 23:41    -   
 Makefile.am                                                       01-Jun-2013 01:20  212   
 Makefile.in                                                       01-Jun-2019 09:11   15K  
 README                                                            17-Mar-2014 09:32  1.7K  
 accessx                                                           17-Mar-2014 09:32  1.1K  
 basic                                                             17-Mar-2014 09:32  1.0K  
 caps                                                              17-Mar-2014 09:32  507   
 complete                                                          17-Mar-2014 09:32  228   
 iso9995                                                           17-Mar-2014 09:32  1.6K  
 japan                                                             17-Mar-2014 09:32  1.0K  
 ledcaps                                                           17-Mar-2014 09:32  469   
 lednum                                                            17-Mar-2014 09:32  466   
 ledscroll                                                         17-Mar-2014 09:32  486   
 level5                                                            17-Mar-2014 09:32  1.4K  
 misc                                                              17-Mar-2014 09:32  2.7K  
 mousekeys                                                         17-Mar-2014 09:32  4.5K  
 olpc                                                              17-Mar-2014 09:32  1.1K  
 pc                                                                17-Mar-2014 09:32  340   
 pc98                                                              17-Mar-2014 09:32  1.2K  
 xfree86                                                           17-Mar-2014 09:32  1.8K  
 xtest                                                             17-Mar-2014 09:32  1.4K  

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