This file is indexed.

/usr/share/X11/xkb/symbols/at 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 a keyboard map from an 'xkb/symbols/de' file

default
xkb_symbols "basic" {

    include "de(basic)"

    name[Group1]="German (Austria)";
};

partial alphanumeric_keys
xkb_symbols "nodeadkeys" {

    include "de(nodeadkeys)"

    name[Group1]="German (Austria, eliminate dead keys)";
};

partial alphanumeric_keys
xkb_symbols "mac" {

    include "de(mac)"

    name[Group1]= "German (Austria, Macintosh)";
};

partial alphanumeric_keys
xkb_symbols "sundeadkeys" {

    include "de(Sundeadkeys)"

    name[Group1]="German (Austria, Sun dead keys)";
};