This file is indexed.

/usr/share/X11/xkb/symbols/mao 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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default  partial alphanumeric_keys
xkb_symbols "basic" {

    // Adds the macrons needed for the Maori language to
    // a simple US keyboard layout.

    include "latin"

    name[Group1]="Maori";

    key <AC01>  { [ a,   A,  amacron, Amacron ] };
    key <AD03>  { [ e,   E,  emacron, Emacron ] };
    key <AD08>  { [ i,   I,  imacron, Imacron ] };

    key <AD09>  { [ o,   O,  omacron, Omacron ] };
    key <AD07>  { [ u,   U,  umacron, Umacron ] };

    key <RALT>  { type[Group1]="TWO_LEVEL",
                  [ ISO_Level3_Shift, Multi_key ] };

    modifier_map Mod5   { <RALT> };
};