This file is indexed.

/usr/share/X11/xkb/compat/japan 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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// Japanese keyboards need the Eisu and Kana Shift
// and Lock keys, which are typically bound to the
// second shift level of some other modifier key.
// These interpretations disable the default
// interpretation (which would have these keys set
// to the same modifier as the level one symbol).

default partial xkb_compatibility "japan" {

    interpret.repeat= False;

    interpret Eisu_Shift+Lock {
	action= NoAction();
    };

    interpret Eisu_toggle+Lock {
	action= NoAction();
    };

    interpret Kana_Shift+Lock {
	action= NoAction();
    };

    interpret Kana_Lock+Lock {
	action= NoAction();
    };
};

// Some Japanese keyboards have an explict
// Kana Lock key and matching LED.
partial xkb_compatibility "kana_lock" {

    virtual_modifiers  Kana_Lock;

    interpret Kana_Lock+AnyOfOrNone(all) {
	virtualModifier= Kana_Lock;
	useModMapMods=level1;
	action= LockGroup(group=+1);
    };

    indicator "Kana" {
        !allowExplicit;
	groups= All-Group1;
    };
};