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/usr/share/X11/xkb/compat/level5 is in xkb-data 2.12-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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// Fairly complete set of symbol interpretations
// to provide reasonable default behavior.

default partial xkb_compatibility "default" {

    virtual_modifiers  LevelFive;

    interpret.repeat= False;
    setMods.clearLocks= True;
    latchMods.clearLocks= True;
    latchMods.latchToLock= True;

    interpret ISO_Level5_Shift+Any {
	useModMapMods= level1;
	virtualModifier= LevelFive;
	action= SetMods(modifiers=LevelFive);
    };

    interpret ISO_Level5_Shift {
	action= SetMods(modifiers=LevelFive);
    };

    interpret ISO_Level5_Latch+Any {
	useModMapMods= level1;
	virtualModifier= LevelFive;
	action= LatchMods(modifiers=LevelFive);
    };

    interpret ISO_Level5_Latch {
	action= LatchMods(modifiers=LevelFive);
    };

    interpret ISO_Level5_Lock+Any {
	useModMapMods= level1;
	virtualModifier= LevelFive;
	action= LockMods(modifiers=LevelFive);
    };

    interpret ISO_Level5_Lock {
	action= LockMods(modifiers=LevelFive);
    };
};

partial xkb_compatibility "level5_lock" {
    // This defines a Level5-Lock using the NumLock real modifier
    // in order to create arbitrary level-behaviour, which would
    // not be possible with the virtual modifier.
    // See also: types/level5 : EIGHT_LEVEL_LEVEL_FIVE_LOCK
    // See also: symbols/level5(lock)

    virtual_modifiers  NumLock;

    interpret ISO_Level5_Lock {
	action = LockMods(modifiers = NumLock);
    };
};