This file is indexed.

/usr/share/X11/xkb/symbols/dk is in xkb-data 2.5-1ubuntu1.

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 a keyboard map from an 'xkb/symbols/dk' file

partial default alphanumeric_keys
xkb_symbols "basic" {

    include "latin(type2)"

    name[Group1]="Danish";

    key <AE11>	{ [      plus,   question,    plusminus, questiondown ]	};
    key <AE12>	{ [dead_acute, dead_grave,          bar,    brokenbar ]	};


    key <AC10>	{ [        ae,        AE,   dead_acute, dead_doubleacute ] };
    key <AC11>	{ [    oslash,  Ooblique, dead_circumflex, dead_caron ]	};
    key <TLDE>	{ [   onehalf,   section, threequarters,    paragraph ]	};

    key <BKSL>	{ [apostrophe,   asterisk, dead_doubleacute, multiply ]	};

    key <LSGT>	{ [      less,    greater,    backslash,      notsign ]	};

    include "kpdl(comma)"

    include "level3(ralt_switch)"
};

partial alphanumeric_keys
xkb_symbols "nodeadkeys" {

    include "dk(basic)"

    name[Group1]="Danish (eliminate dead keys)";

    key <AE12>	{ [     acute,      grave,          bar,       ogonek ]	};
    key <AD11>	{ [     aring,      Aring,    diaeresis,       degree ]	};
    key <AD12>	{ [ diaeresis, asciicircum,  asciitilde,       macron ]	};
    key <AC10>	{ [        ae,         AE,        acute,  doubleacute ]	};
    key <AC11>	{ [    oslash,   Ooblique,  asciicircum,        caron ]	};
    key <BKSL>	{ [apostrophe,   asterisk,  doubleacute,     multiply ]	};
    key <AB08>	{ [     comma,  semicolon,      cedilla,       ogonek ]	};
    key <AB09>	{ [    period,      colon, periodcentered,   abovedot ]	};

};

// Copied from macintosh_vndr/dk
partial alphanumeric_keys 
xkb_symbols "mac" {

    include "dk"
    name[Group1]= "Danish (Macintosh)";

    key <SPCE>	{ [    space,       space, nobreakspace, nobreakspace ]	};
    key <AB10>	{ [    minus,  underscore,       hyphen,       macron ]	};
    include "kpdl(dot)"
};


partial alphanumeric_keys 
xkb_symbols "mac_nodeadkeys" {
    include "dk(mac)"
    name[Group1]= "Danish (Macintosh, eliminate dead keys)";

    key <AE12>	{ [    acute,       grave,          bar,       ogonek ]	};
    key <AD12>	{ [diaeresis, asciicircum,   asciitilde,  dead_macron ]	};
};

partial alphanumeric_keys 
xkb_symbols "dvorak" {
    include "no(dvorak)"

    name[Group1]= "Danish (Dvorak)";
};