This file is indexed.

/usr/share/X11/xkb/symbols/rs 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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// Bosnian, Croatian, Serbian and Slovenian XKB keyboard mappings.
//
// Derived from "Danube" D.2 from 2003-05-12,
// which is available at http://srpski.org/dunav/.
//
// Original authors:
//  Danilo Segan (Данило Шеган) <danilo@kvota.net>
//  Chusslove Illich (Часлав Илић) <caslav.ilic@gmx.net>
//
// Danilo Segan <danilo@kvota.net>:
// - Modified for inclusion in XFree86.
// - Further modifications on 2005-08-18 to support Bosnian,
//   Croatian and Slovenian in xkeyboard-config.

default  partial alphanumeric_keys
xkb_symbols "basic" {

    name[Group1]= "Serbian";

    include "rs(cyrlevel3)"
    include "rs(common)"
    include "rs(cyralpha)"
    include "level3(ralt_switch)"
};

partial alphanumeric_keys
xkb_symbols "latin" {

    name[Group1]= "Serbian (Latin)";

    include "latin(type3)"
    include "rs(latalpha)"
    include "rs(latlevel3)"
    include "rs(common)"
    include "level3(ralt_switch)"
};

partial alphanumeric_keys
xkb_symbols "yz" {

    include "rs(basic)"
    name[Group1]= "Serbian (Cyrillic, ZE and ZHE swapped)";

    key <AD06> { [ Cyrillic_zhe,    Cyrillic_ZHE,  any, any ] }; // y
    key <AB01> { [ Cyrillic_ze,     Cyrillic_ZE,   any, any ] }; // z
};

hidden partial alphanumeric_keys
xkb_symbols "common" {
    // "Common" keys: keys that are the same
    // for both latin and cyrillic keyboards.

    key.type[Group1] = "FOUR_LEVEL";

    key <TLDE> { [ grave,          asciitilde,     any, any ] };
    key <AE01> { [ 1,              exclam,         any, any ] };
    key <AE02> { [ 2,              quotedbl,       any, any ] };
    key <AE03> { [ 3,              numbersign,     any, any ] };
    key <AE04> { [ 4,              dollar,         any, any ] };
    key <AE05> { [ 5,              percent,        any, any ] };
    key <AE06> { [ 6,              ampersand,      any, any ] };
    key <AE07> { [ 7,              slash,          any, any ] };
    key <AE08> { [ 8,              parenleft,      any, any ] };
    key <AE09> { [ 9,              parenright,     any, any ] };
    key <AE10> { [ 0,              equal,          any, any ] };
    key <AE11> { [ apostrophe,     question,       any, any ] };
    key <AE12> { [ plus,           asterisk,       any, any ] };

    key <AB08> { [ comma,          semicolon,      any, any ] };
    key <AB09> { [ period,         colon,          any, any ] };
    key <AB10> { [ minus,          underscore,     any, any ] };

    include "kpdl(comma)"
};

hidden partial alphanumeric_keys
xkb_symbols "cyralpha" {

    key.type[Group1] = "FOUR_LEVEL_ALPHABETIC";

    key <AD01> { [ Cyrillic_lje,   Cyrillic_LJE,   any, any ] }; // q
    key <AD02> { [ Cyrillic_nje,   Cyrillic_NJE,   any, any ] }; // w
    key <AD03> { [ Cyrillic_ie,    Cyrillic_IE,    any, any ] }; // e
    key <AD04> { [ Cyrillic_er,    Cyrillic_ER,    any, any ] }; // r
    key <AD05> { [ Cyrillic_te,    Cyrillic_TE,    any, any ] }; // t
    key <AD06> { [ Cyrillic_ze,    Cyrillic_ZE,    any, any ] }; // y
    key <AD07> { [ Cyrillic_u,     Cyrillic_U,     any, any ] }; // u
    key <AD08> { [ Cyrillic_i,     Cyrillic_I,     any, any ] }; // i
    key <AD09> { [ Cyrillic_o,     Cyrillic_O,     any, any ] }; // o
    key <AD10> { [ Cyrillic_pe,    Cyrillic_PE,    any, any ] }; // p
    key <AD11> { [ Cyrillic_sha,   Cyrillic_SHA,   any, any ] }; // [ {
    key <AD12> { [ Serbian_dje,    Serbian_DJE,    any, any ] }; // ] }

    key <AC01> { [ Cyrillic_a,     Cyrillic_A,     any, any ] }; // a
    key <AC02> { [ Cyrillic_es,    Cyrillic_ES,    any, any ] }; // s
    key <AC03> { [ Cyrillic_de,    Cyrillic_DE,    any, any ] }; // d
    key <AC04> { [ Cyrillic_ef,    Cyrillic_EF,    any, any ] }; // f
    key <AC05> { [ Cyrillic_ghe,   Cyrillic_GHE,   any, any ] }; // g
    key <AC06> { [ Cyrillic_ha,    Cyrillic_HA,    any, any ] }; // h
    key <AC07> { [ Cyrillic_je,    Cyrillic_JE,    any, any ] }; // j
    key <AC08> { [ Cyrillic_ka,    Cyrillic_KA,    any, any ] }; // k
    key <AC09> { [ Cyrillic_el,    Cyrillic_EL,    any, any ] }; // l
    key <AC10> { [ Cyrillic_che,   Cyrillic_CHE,   any, any ] }; // ; :
    key <AC11> { [ Serbian_tshe,   Serbian_TSHE,   any, any ] }; // ' "
    key <BKSL> { [ Cyrillic_zhe,   Cyrillic_ZHE,   any, any ] }; // \ |

    key <AB01> { [ Cyrillic_zhe,   Cyrillic_ZHE,   any, any ] }; // z
    key <AB02> { [ Cyrillic_dzhe,  Cyrillic_DZHE,  any, any ] }; // x
    key <AB03> { [ Cyrillic_tse,   Cyrillic_TSE,   any, any ] }; // c
    key <AB04> { [ Cyrillic_ve,    Cyrillic_VE,    any, any ] }; // v
    key <AB05> { [ Cyrillic_be,    Cyrillic_BE,    any, any ] }; // b
    key <AB06> { [ Cyrillic_en,    Cyrillic_EN,    any, any ] }; // n
    key <AB07> { [ Cyrillic_em,    Cyrillic_EM,    any, any ] }; // m
};


hidden partial alphanumeric_keys
xkb_symbols "latalpha" {

    key.type[Group1] = "FOUR_LEVEL_ALPHABETIC";

    key <AD11> { [ scaron,         Scaron,         any, any ] }; // [ {
    key <AD12> { [ dstroke,        Dstroke,        any, any ] }; // ] }

    key <AC10> { [ ccaron,         Ccaron,         any, any ] }; // ; :
    key <AC11> { [ cacute,         Cacute,         any, any ] }; // ' "
    key <BKSL> { [ zcaron,         Zcaron,         any, any ] }; // \ |
};

hidden partial alphanumeric_keys
xkb_symbols "twoletter" {

    // Letters which are written in latin transcription with two characters.
    key <AD01> { type[Group1] = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC",
               [ U1C9,           U1C8,          any, U1C7 ] }; // q
    key <AD02> { type[Group1] = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC",
               [ U1CC,           U1CB,          any, U1CA ] }; // w
    key <AB02> { type[Group1] = "SEPARATE_CAPS_AND_SHIFT_ALPHABETIC",
               [ U1C6,           U1C5,          any, U1C4 ] }; // x

    // Also replace letter Y with Zcaron, since Y is of no use any longer.
    key <AB01> { [ zcaron,         Zcaron,        any, any ] }; // z
};

hidden partial alphanumeric_keys
xkb_symbols "latlevel3" {
    key <TLDE> { [ any, any,   notsign,             notsign          ] }; // ` ~
    key <AE01> { [ any, any,   dead_tilde,          asciitilde       ] }; // 1 !
    key <AE02> { [ any, any,   dead_caron,          caron            ] }; // 2 @
    key <AE03> { [ any, any,   dead_circumflex,     asciicircum      ] }; // 3 #
    key <AE04> { [ any, any,   dead_breve,          breve            ] }; // 4 $
    key <AE05> { [ any, any,   dead_abovering,      degree           ] }; // 5 %
    key <AE06> { [ any, any,   dead_ogonek,         ogonek           ] }; // 6 ^
    key <AE07> { [ any, any,   dead_grave,          grave            ] }; // 7 &
    key <AE08> { [ any, any,   dead_abovedot,       abovedot         ] }; // 8 *
    key <AE09> { [ any, any,   dead_acute,          apostrophe       ] }; // 9 (
    key <AE10> { [ any, any,   dead_doubleacute,    doubleacute      ] }; // 0 )
    key <AE11> { [ any, any,   dead_diaeresis,      diaeresis        ] }; // - _
    key <AE12> { [ any, any,   dead_cedilla,        cedilla          ] }; // = +

    key <AD01> { [ any, any,   backslash,           Greek_OMEGA      ] }; // q
    key <AD02> { [ any, any,   bar,                 Lstroke          ] }; // w
    key <AD03> { [ any, any,   EuroSign,            EuroSign         ] }; // e
    key <AD04> { [ any, any,   paragraph,           registered       ] }; // r
    key <AD05> { [ any, any,   tslash,              Tslash           ] }; // t // ALPHABETIC
    key <AD06> { [ any, any,   leftarrow,           yen              ] }; // y
    key <AD07> { [ any, any,   downarrow,           uparrow          ] }; // u
    key <AD08> { [ any, any,   rightarrow,          idotless         ] }; // i
    key <AD09> { [ any, any,   oslash,              Ooblique         ] }; // o // ALPHABETIC
    key <AD10> { [ any, any,   thorn,               THORN            ] }; // p // ALPHABETIC
    key <AD11> { [ any, any,   division,            dead_abovering   ] }; // [
    key <AD12> { [ any, any,   multiply,            dead_macron      ] }; // ]

    key <AC01> { [ any, any,   ae,                  AE               ] }; // a // ALPHABETIC
    key <AC02> { [ any, any,   doublelowquotemark,  guillemotright   ] }; // s
    key <AC03> { [ any, any,   leftdoublequotemark, guillemotleft    ] }; // d
    key <AC04> { [ any, any,   bracketleft,         ordfeminine      ] }; // f
    key <AC05> { [ any, any,   bracketright,        ENG              ] }; // g
    key <AC06> { [ any, any,   hstroke,             Hstroke          ] }; // h // ALPHABETIC
    key <AC07> { [ any, any,   NoSymbol,            NoSymbol         ] }; // j
    key <AC08> { [ any, any,   lstroke,             ampersand        ] }; // k
    key <AC09> { [ any, any,   lstroke,             Lstroke          ] }; // l
    key <AC10> { [ any, any,   dead_acute,          dead_doubleacute ] }; // ;
    key <AC11> { [ any, any,   ssharp,              dead_caron       ] }; // '
    key <BKSL> { [ any, any,   currency,            dead_breve       ] }; // \

    key <AB01> { [ any, any,   leftsinglequotemark, guillemotright   ] }; // z
    key <AB02> { [ any, any,   rightsinglequotemark,guillemotleft    ] }; // x
    key <AB03> { [ any, any,   cent,                copyright        ] }; // c
    key <AB04> { [ any, any,   at,                  grave            ] }; // v
    key <AB05> { [ any, any,   braceleft,           apostrophe       ] }; // b
    key <AB06> { [ any, any,   braceright,          braceright       ] }; // n
    key <AB07> { [ any, any,   asciicircum,         masculine        ] }; // m
    key <AB08> { [ any, any,   less,                multiply         ] }; // , <
    key <AB09> { [ any, any,   greater,             division         ] }; // . >
    key <AB10> { [ any, any,   emdash,              endash           ] }; // / ?
};

hidden partial alphanumeric_keys
xkb_symbols "cyrlevel3" {
    key <TLDE> { [ any, any,   degree,              notsign          ] }; // ` ~
    key <AE03> { [ any, any,   dead_circumflex,     NoSymbol         ] }; // 3 #
    key <AE07> { [ any, any,   dead_grave,          NoSymbol         ] }; // 7 &
    key <AE08> { [ any, any,   dead_doublegrave,    NoSymbol         ] }; // 8 *
    key <AE09> { [ any, any,   dead_acute,          NoSymbol         ] }; // 9 (
    key <AE10> { [ any, any,   dead_invertedbreve,  NoSymbol         ] }; // 0 )
    key <AE11> { [ any, any,   dead_macron,         NoSymbol         ] }; // - _

    key <AD01> { [ any, any,   backslash,           NoSymbol         ] }; // q
    key <AD02> { [ any, any,   bar,                 NoSymbol         ] }; // w
    key <AD03> { [ any, any,   EuroSign,            sterling         ] }; // e
    key <AD04> { [ any, any,   paragraph,           registered       ] }; // r
    key <AD05> { [ any, any,   ellipsis,            NoSymbol         ] }; // t // ALPHABETIC
    key <AD06> { [ any, any,   leftarrow,           yen              ] }; // y
    key <AD07> { [ any, any,   downarrow,           uparrow          ] }; // u
    key <AD08> { [ any, any,   rightarrow,          NoSymbol         ] }; // i
    key <AD09> { [ any, any,   section,             NoSymbol         ] }; // o // ALPHABETIC
    key <AD11> { [ any, any,   division,            NoSymbol         ] }; // [
    key <AD12> { [ any, any,   multiply,            NoSymbol         ] }; // ]

    key <AC02> { [ any, any,   doublelowquotemark,  guillemotright   ] }; // s
    key <AC03> { [ any, any,   leftdoublequotemark, guillemotleft    ] }; // d
    key <AC04> { [ any, any,   bracketleft,         NoSymbol         ] }; // f
    key <AC05> { [ any, any,   bracketright,        NoSymbol         ] }; // g
    key <BKSL> { [ any, any,   currency,            NoSymbol         ] }; // \

    key <AB01> { [ any, any,   leftsinglequotemark, NoSymbol         ] }; // z
    key <AB02> { [ any, any,   rightsinglequotemark,NoSymbol         ] }; // x
    key <AB03> { [ any, any,   cent,                copyright        ] }; // c
    key <AB04> { [ any, any,   at,                  NoSymbol         ] }; // v
    key <AB05> { [ any, any,   braceleft,           NoSymbol         ] }; // b
    key <AB06> { [ any, any,   braceright,          NoSymbol         ] }; // n
    key <AB07> { [ any, any,   asciicircum,         NoSymbol         ] }; // m
    key <AB08> { [ any, any,   less,                NoSymbol         ] }; // , <
    key <AB09> { [ any, any,   greater,             NoSymbol         ] }; // . >
    key <AB10> { [ any, any,   emdash,              endash           ] }; // / ?
};

partial alphanumeric_keys
xkb_symbols "latinunicode" {
    // This mapping supports the Unicode characters 0x1c4-0x1cc (dz, lj, and nj
    // as single character). You get the title form with AltGr+Shift.

    include "rs(latin)"
    name[Group1]= "Serbian (Latin Unicode)";

    include "rs(twoletter)"
};

partial alphanumeric_keys
xkb_symbols "latinyz" {
    // For those who insist on using "english-position" Z and Y.

    include "rs(latin)"
    name[Group1]= "Serbian (Latin qwerty)";

    key <AD06> { [ y,              Y,              any, any ] }; // y
    key <AB01> { [ z,              Z,              any, any ] }; // z
};

partial alphanumeric_keys
xkb_symbols "latinunicodeyz" {
    // Unicode, ZHE and Z swapped.

    include "rs(latinunicode)"
    name[Group1]= "Serbian (Latin Unicode qwerty)";

    key <AD06> { [ zcaron,         Zcaron,         any, any ] }; // y
    key <AB01> { [ z,              Z,              any, any ] }; // z
};

xkb_symbols "alternatequotes" {
    // Another acceptable »pair of quotes« for Serbian.

    include "rs(basic)"
    name[Group1]= "Serbian (Cyrillic with guillemets)";

    key <AC02> { [ any, any,   guillemotright, NoSymbol ] }; // s
    key <AC03> { [ any, any,   guillemotleft,  NoSymbol ] }; // d
};

xkb_symbols "latinalternatequotes" {
    // Another acceptable »pair of quotes« for Serbian.

    include "rs(latin)"
    name[Group1]= "Serbian (Latin with guillemets)";

    key <AC02> { [ any, any,   guillemotright, NoSymbol ] }; // s
    key <AC03> { [ any, any,   guillemotleft,  NoSymbol ] }; // d
};

xkb_symbols "rue" {
    // Layout for Pannonian Rusyn (spoken mainly in Serbia and Croatia
    // by the Rusyn people), based on Serbian Cyrillic layout.
    // Authors:
    //   Ljubomir J. Papuga (Любомир Я. Папуґа) <papuga@zoho.com>
    //   Mihajlo Hornjak <smeceiotpad@gmail.com>

    include "rs(basic)"
    name[Group1]= "Pannonian Rusyn";

    key <TLDE> { [ Cyrillic_softsign,         Cyrillic_SOFTSIGN         ] }; // `

    key <AD01> { [ Cyrillic_ya,               Cyrillic_YA               ] }; // q
    key <AD02> { [ Ukrainian_ie,              Ukrainian_IE              ] }; // w
    key <AD12> { [ Cyrillic_shcha,            Cyrillic_SHCHA            ] }; // ]

    key <AC05> { [ Ukrainian_ghe_with_upturn, Ukrainian_GHE_WITH_UPTURN ] }; // g
    key <AC07> { [ Cyrillic_shorti,           Cyrillic_SHORTI           ] }; // j
    key <AC11> { [ Cyrillic_ghe,              Cyrillic_GHE              ] }; // '

    key <AB01> { [ Cyrillic_yu,               Cyrillic_YU               ] }; // z
    key <AB02> { [ Ukrainian_yi,              Ukrainian_YI              ] }; // x
};

// EXTRAS:

xkb_symbols "combiningkeys" {
    // Raw combining characters instead of dead keys,
    // especially good for post-accenting texts.

    include "rs(basic)"
    name[Group1]= "Serbian (combining accents instead of dead keys)";

    key <AE03> { [ any, any,   U0302, dead_circumflex ] }; // 3, U0302 = COMBINING CIRCUMFLEX ACCENT
    key <AE07> { [ any, any,   U0300, NoSymbol        ] }; // 7, U0300 = COMBINING GRAVE ACCENT
    key <AE08> { [ any, any,   U030F, NoSymbol        ] }; // 8, U030F = COMBINING DOUBLE GRAVE ACCENT
    key <AE09> { [ any, any,   U0301, NoSymbol        ] }; // 9, U0301 = COMBINING ACUTE ACCENT
    key <AE10> { [ any, any,   U0311, NoSymbol        ] }; // 0, U0311 = COMBINING INVERTED BREVE
    key <AE11> { [ any, any,   U0304, NoSymbol        ] }; // -, U0304 = COMBINING MACRON
};