This file is indexed.

/usr/share/X11/xkb/types/basic is in xkb-data 2.10.1-1ubuntu1.

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 xkb_types "basic" {

    // Fairly standard definitions for
    // the four required key types

    virtual_modifiers NumLock;

    type "ONE_LEVEL" {
	modifiers = None;
	map[None] = Level1;
	level_name[Level1]= "Any";
    };

    type "TWO_LEVEL" {
	modifiers = Shift;
	map[Shift] = Level2;
	level_name[Level1] = "Base";
	level_name[Level2] = "Shift";
    };

    type "ALPHABETIC" {
        modifiers = Shift+Lock;
        map[Shift] = Level2;
        map[Lock] = Level2;
        level_name[Level1] = "Base";
        level_name[Level2] = "Caps";
    };

};