This file is indexed.

/usr/share/X11/xkb/compat/pc98 is in xkb-data 2.23.1-1ubuntu1.

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

The actual contents of the file can be viewed below.

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// Minimal set of symbol interpretations to provide
// reasonable default behavior (Num lock, Shift lock,
// and Mode switch) and set up the automatic updating
// of common keyboard LEDs.

default xkb_compatibility "basic" {

    virtual_modifiers  NumLock,AltGr;

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

    interpret Shift_Lock+AnyOf(Shift+Lock) {
	action= LockMods(modifiers=Shift);
    };

//    interpret Any+Lock {
//	action= LockMods(modifiers=Lock);
//    };

    interpret Num_Lock+Any {
	virtualModifier= NumLock;
	action= LockMods(modifiers=NumLock);
    };

    interpret Mode_switch {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= SetGroup(group=2,clearLocks);
    };

    interpret Any + Any {
	action= SetMods(modifiers=modMapMods);
    };

    group 2 = AltGr;
    group 3 = AltGr;
    group 4 = AltGr;

    indicator.allowExplicit= False;
    indicator "Caps Lock" {
	whichModState= Locked;
	modifiers= Lock;
    };
    indicator "Num Lock" {
	whichModState= Locked;
	modifiers= NumLock;
    };
    indicator "Shift Lock" {
	whichModState= Locked;
	modifiers= Shift;
    };
    indicator.allowExplicit= True;
};