This file is indexed.

/usr/share/X11/xkb/symbols/si 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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default partial alphanumeric_keys
xkb_symbols "basic" {

    name[Group1]="Slovenian";

    include "rs(latin)"

    key <TLDE> { type[Group1]="TWO_LEVEL", [ cedilla, diaeresis ] };
};

partial alphanumeric_keys 
xkb_symbols "us" {

    name[Group1]= "Slovenian (US keyboard with Slovenian letters)";

    include "rs(latinyz)"

    key <TLDE> { type[Group1]="TWO_LEVEL", [ cedilla, diaeresis ] };
};


partial alphanumeric_keys 
xkb_symbols "alternatequotes" {

    name[Group1]= "Slovenian (use guillemets for quotes)";

    include "rs(latinalternatequotes)"

    key <TLDE> { type[Group1]="TWO_LEVEL", [ cedilla, diaeresis ] };
};