This file is indexed.

/usr/share/X11/xkb/symbols/za is in xkb-data 2.16-1ubuntu1.

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

The actual contents of the file can be viewed below.

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// Based on the Latvian and GB keyboard maps.

default  partial alphanumeric_keys modifier_keys
xkb_symbols "basic" {

    // Describes the differences between an en_US layout
    // and a South African layout with dead keys.
    // By Dwayne Bailey (dwayne@translate.org.za).

    include "latin"

    name[Group1]="English (South Africa)";

    key <TLDE>  { [     grave, asciitilde,  dead_grave                ] };
    key <AE02>  { [         2,         at,         yen                ] };
    key <AE03>  { [         3, numbersign,    sterling                ] };
    key <AE04>  { [         4,     dollar,      dollar                ] };
    key <AE05>  { [         5,    percent,    EuroSign                ] };
    key <AE06>  { [         6,asciicircum, dead_circumflex            ] };

    key <AD03>  { [         e,          E,  ediaeresis,    Ediaeresis ] };
    key <AD04>  { [         r,          R, ecircumflex,   Ecircumflex ] };
    key <AD05>  { [         t,          T,       U1e71,         U1e70 ] };
    key <AD06>  { [         y,          Y, ucircumflex,   Ucircumflex ] };
    key <AD07>  { [         u,          U,  udiaeresis,    Udiaeresis ] };
    key <AD08>  { [         i,          I,  idiaeresis,    Idiaeresis ] };
    key <AD09>  { [         o,          O,  odiaeresis,    Odiaeresis ] };
    key <AD10>  { [         p,          P, ocircumflex,   Ocircumflex ] };

    key <AC01>  { [         a,          A,  adiaeresis,    Adiaeresis ] };
    key <AC02>  { [         s,          S,      scaron,        Scaron ] };
    key <AC03>  { [         d,          D,       U1e13,         U1e12 ] };
    key <AC09>  { [         l,          L,       U1e3d,         U1e3c ] };
    key <AC10>  { [ semicolon,      colon, dead_diaeresis             ] };
    key <AC11>  { [apostrophe,   quotedbl,  dead_acute                ] };

    key <AB06>  { [         n,          N,       U1e4b,         U1e4a ] };
    key <AB07>  { [         m,          M,       U1e45,         U1e44 ] };
    key <AB09>  { [    period,    greater, dead_abovedot              ] };

    include "level3(ralt_switch)"
};