1*2b949d04SAndroid Build Coastguard Worker# Compatibility 2*2b949d04SAndroid Build Coastguard Worker 3*2b949d04SAndroid Build Coastguard WorkerRelative to the XKB 1.0 specification implemented in current X servers, 4*2b949d04SAndroid Build Coastguard Workerxkbcommon has removed support for some parts of the specification which 5*2b949d04SAndroid Build Coastguard Workerintroduced unnecessary complications. Many of these removals were in fact 6*2b949d04SAndroid Build Coastguard Workernot implemented, or half-implemented at best, as well as being totally 7*2b949d04SAndroid Build Coastguard Workerunused in the standard dataset. 8*2b949d04SAndroid Build Coastguard Worker 9*2b949d04SAndroid Build Coastguard WorkerNotable removals: 10*2b949d04SAndroid Build Coastguard Worker- geometry support 11*2b949d04SAndroid Build Coastguard Worker + there were very few geometry definitions available, and while 12*2b949d04SAndroid Build Coastguard Worker xkbcommon was responsible for parsing this insanely complex format, 13*2b949d04SAndroid Build Coastguard Worker it never actually did anything with it 14*2b949d04SAndroid Build Coastguard Worker + hopefully someone will develop a companion library which supports 15*2b949d04SAndroid Build Coastguard Worker keyboard geometries in a more useful format 16*2b949d04SAndroid Build Coastguard Worker- KcCGST (keycodes/compat/geometry/symbols/types) API 17*2b949d04SAndroid Build Coastguard Worker + use RMLVO instead; KcCGST is now an implementation detail 18*2b949d04SAndroid Build Coastguard Worker + including pre-defined keymap files 19*2b949d04SAndroid Build Coastguard Worker- XKM support 20*2b949d04SAndroid Build Coastguard Worker + may come in an optional X11 support/compatibility library 21*2b949d04SAndroid Build Coastguard Worker- around half of the interpret actions 22*2b949d04SAndroid Build Coastguard Worker + pointer device, message and redirect actions in particular 23*2b949d04SAndroid Build Coastguard Worker- non-virtual modifiers 24*2b949d04SAndroid Build Coastguard Worker + core and virtual modifiers have been collapsed into the same 25*2b949d04SAndroid Build Coastguard Worker namespace, with a 'significant' flag that largely parallels the 26*2b949d04SAndroid Build Coastguard Worker core/virtual split 27*2b949d04SAndroid Build Coastguard Worker- radio groups 28*2b949d04SAndroid Build Coastguard Worker + completely unused in current keymaps, never fully implemented 29*2b949d04SAndroid Build Coastguard Worker- overlays 30*2b949d04SAndroid Build Coastguard Worker + almost completely unused in current keymaps 31*2b949d04SAndroid Build Coastguard Worker- key behaviors 32*2b949d04SAndroid Build Coastguard Worker + used to implement radio groups and overlays, and to deal with things 33*2b949d04SAndroid Build Coastguard Worker like keys that physically lock; unused in current keymaps 34*2b949d04SAndroid Build Coastguard Worker- indicator behaviours such as LED-controls-key 35*2b949d04SAndroid Build Coastguard Worker + the only supported LED behaviour is key-controls-LED; again this 36*2b949d04SAndroid Build Coastguard Worker was never really used in current keymaps 37*2b949d04SAndroid Build Coastguard Worker 38*2b949d04SAndroid Build Coastguard WorkerOn the other hand, some features and extensions were added. 39*2b949d04SAndroid Build Coastguard Worker 40*2b949d04SAndroid Build Coastguard WorkerNotable additions: 41*2b949d04SAndroid Build Coastguard Worker- 32-bit keycodes 42*2b949d04SAndroid Build Coastguard Worker- extended number of modifiers (planned) 43*2b949d04SAndroid Build Coastguard Worker- extended number of groups (planned) 44*2b949d04SAndroid Build Coastguard Worker- multiple keysyms per level 45*2b949d04SAndroid Build Coastguard Worker + such levels are ignored by x11/xkbcomp. 46*2b949d04SAndroid Build Coastguard Worker- key names (e.g. `<AE11>`) can be longer than 4 characters. 47*2b949d04SAndroid Build Coastguard Worker 48*2b949d04SAndroid Build Coastguard Worker## Compose support 49*2b949d04SAndroid Build Coastguard Worker 50*2b949d04SAndroid Build Coastguard WorkerRelative to the standard implementation in libX11 (described in the 51*2b949d04SAndroid Build Coastguard WorkerCompose(5) man-page), some features are not supported: 52*2b949d04SAndroid Build Coastguard Worker 53*2b949d04SAndroid Build Coastguard Worker- the (! MODIFIER) syntax 54*2b949d04SAndroid Build Coastguard Worker + parsed correctly but ignored. 55*2b949d04SAndroid Build Coastguard Worker- using modifier keysyms in Compose sequences 56*2b949d04SAndroid Build Coastguard Worker- several interactions with Braille keysyms 57