This file is indexed.

/usr/share/X11/xkb/symbols/mm is in xkb-data 2.5.1-3.

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

The actual contents of the file can be viewed below.

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partial default alphanumeric_keys 
xkb_symbols "basic" {
    name[Group1]= "Burmese";

    // Alphanumeric section
    key <TLDE> { [      U1050,      U100E,        grave,  asciitilde ] };
    key <AE01> { [      U1041,      U100D,            1,      exclam ] };
    key <AE02> { [      U1042,      U1052,            2,          at ] };
    key <AE03> { [      U1043,      U100B,            3,  numbersign ] };
    key <AE04> { [      U1044,      U1053,            4,      dollar ] };
    key <AE05> { [      U1045,      U1054,            5,     percent ] };
    key <AE06> { [      U1046,      U1055,            6, asciicircum ] };
    key <AE07> { [      U1047,      U101B,            7,   ampersand ] };
    key <AE08> { [      U1048,   asterisk,            8,    asterisk ] };
    key <AE09> { [      U1049,  parenleft,            9,   parenleft ] };
    key <AE10> { [      U1040, parenright,            0,  parenright ] };
    key <AE11> { [      minus, underscore,        minus,  underscore ] };
    key <AE12> { [      equal,       plus,        equal,        plus ] };

    key <AD01> { [      U1006,      U1008,            q,           Q ] };
    key <AD02> { [      U1010,      U101D,            w,           W ] };
    key <AD03> { [      U1014,      U1023,            e,           E ] };
    key <AD04> { [      U1019,      U104E,            r,           R ] };
    key <AD05> { [      U1021,      U1024,            t,           T ] };
    key <AD06> { [      U1015,      U104C,            y,           Y ] };
    key <AD07> { [      U1000,      U1025,            u,           U ] };
    key <AD08> { [      U1004,      U104D,            i,           I ] };
    key <AD09> { [      U101E,      U103F,            o,           O ] };
    key <AD10> { [      U1005,      U100F,            p,           P ] };
    key <AD11> { [      U101F,      U1027,  bracketleft,   braceleft ] };
    key <AD12> { [      U1029,      U102A, bracketright,  braceright ] };

    key <AC01> { [      U1031,      U1017,            a,           A ] };
    key <AC02> { [      U103B,      U103E,            s,           S ] };
    key <AC03> { [      U102D,      U102E,            d,           D ] };
    key <AC04> { [      U103A,      U1039,            f,           F ] };
    key <AC05> { [      U102B,      U103D,            g,           G ] };
    key <AC06> { [      U1037,      U1036,            h,           H ] };
    key <AC07> { [      U103C,      U1032,            j,           J ] };
    key <AC08> { [      U102F,      U1012,            k,           K ] };
    key <AC09> { [      U1030,      U1013,            l,           L ] };
    key <AC10> { [      U1038,      U1002,    semicolon,       colon ] };
    key <AC11> { [ apostrophe,    quotedbl                           ] };

    key <AB01> { [      U1016,       U1007,           z,           Z ] };
    key <AB02> { [      U1011,       U100C,           x,           X ] };
    key <AB03> { [      U1001,       U1003,           c,           C ] };
    key <AB04> { [      U101C,       U1020,           v,           V ] };
    key <AB05> { [      U1018,       U101A,           b,           B ] };
    key <AB06> { [      U100A,       U1009,           n,           N ] };
    key <AB07> { [      U102C,       U1026,           m,           M ] };
    key <AB08> { [      comma,        U104A,      comma,        less ] };
    key <AB09> { [     period,        U104B,     period,     greater ] };
    key <AB10> { [      slash,    question                           ] };

    key <BKSL> { [      U104F,       U1051,   backslash,         bar ] };
    // End alphanumeric section
};