default partial
xkb_compatibility "lockOnPress" {

    virtual_modifiers AltGr;

    interpret.repeat= False;

    interpret ISO_Next_Group {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= LockGroup(group=+1, lockOnRelease=false);
    };

    interpret ISO_Prev_Group {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= LockGroup(group=-1, lockOnRelease=false);
    };

    interpret ISO_First_Group {
	action= LockGroup(group=1, lockOnRelease=false);
    };

    interpret ISO_Last_Group {
	action= LockGroup(group=2, lockOnRelease=false);
    };
};

partial
xkb_compatibility "lockOnRelease" {

    virtual_modifiers AltGr;

    interpret.repeat= False;

    interpret ISO_Next_Group {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= LockGroup(group=+1, lockOnRelease);
    };

    interpret ISO_Prev_Group {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= LockGroup(group=-1, lockOnRelease);
    };

    interpret ISO_First_Group {
	action= LockGroup(group=1, lockOnRelease);
    };

    interpret ISO_Last_Group {
	action= LockGroup(group=2, lockOnRelease);
    };
};

partial
xkb_compatibility "group_bounds" {
    interpret ISO_First_Group {
	action= LockGroup(group=first);
    };

    interpret ISO_Last_Group {
	action= LockGroup(group=last);
    };

    indicator "Scroll Lock" {
	modifiers= None;
	groups=All-Last;
    };
};