This file is indexed.

/usr/share/X11/xkb/symbols/za is in xkb-data 2.10.1-1ubuntu1.

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 
    // keyboard 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)"
};