This file is indexed.

/usr/share/X11/xkb/symbols/compose 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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partial modifier_keys
xkb_symbols "ralt" {
    key <RALT>	{ type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "lwin" {
    key <LWIN>	{ type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "rwin" {
    key <RWIN>	{ type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "menu" {
    key <MENU>	{ type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "rctrl" {
    key <RCTL> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "lctrl" {
    key <LCTL> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "caps" {
    key <CAPS> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "102" {
    key <LSGT> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "paus" {
    key <PAUS> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "prsc" {
    key <PRSC> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};

partial modifier_keys
xkb_symbols "sclk" {
    key <SCLK> { type[Group1]="TWO_LEVEL", [ Multi_key, Multi_key ] };
};