This file is indexed.

/usr/share/X11/xkb/symbols/shift is in xkb-data 2.12-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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// Cancel CapsLock when a Shift key is pressed.
partial modifier_keys
xkb_symbols "breaks_caps" {
    key <LFSH> {
	type = "ALPHABETIC",
    	actions [Group1] = [
	    SetMods(modifiers=Shift),
	    SetMods(modifiers=Shift+Lock,clearLocks)
	]
    };
    key <RTSH> {
	type = "ALPHABETIC",
	actions [Group1] = [
	    SetMods(modifiers=Shift),
	    SetMods(modifiers=Shift+Lock,clearLocks)
	]
    };
};


// Toggle CapsLock when pressed together with the other Shift key.
partial modifier_keys
xkb_symbols "lshift_both_capslock" {
  key <LFSH> {
    type[Group1]="TWO_LEVEL",
    symbols[Group1] = [ Shift_L, Caps_Lock ]
  };
};
// Toggle CapsLock when pressed together with the other Shift key.
partial modifier_keys
xkb_symbols "rshift_both_capslock" {
  key <RTSH> {
    type[Group1]="TWO_LEVEL",
    symbols[Group1] = [ Shift_R, Caps_Lock ]
  };
};
partial modifier_keys
xkb_symbols "both_capslock" {
  include "shift(lshift_both_capslock)"
  include "shift(rshift_both_capslock)"
};


// Set CapsLock when pressed with the other Shift key, release it when pressed alone.
partial modifier_keys
xkb_symbols "lshift_both_capslock_cancel" {
  key <LFSH> {
    type[Group1]="ALPHABETIC",
    symbols[Group1] = [ Shift_L, Caps_Lock ]
  };
};
// Set CapsLock when pressed with the other Shift key, release it when pressed alone.
partial modifier_keys
xkb_symbols "rshift_both_capslock_cancel" {
  key <RTSH> {
    type[Group1]="ALPHABETIC",
    symbols[Group1] = [ Shift_R, Caps_Lock ]
  };
};
partial modifier_keys
xkb_symbols "both_capslock_cancel" {
  include "shift(lshift_both_capslock_cancel)"
  include "shift(rshift_both_capslock_cancel)"
};


// Toggle ShiftLock when pressed together with the other Shift key.
partial modifier_keys
xkb_symbols "lshift_both_shiftlock" {
  key <LFSH> {
    type[Group1]="TWO_LEVEL",
    symbols[Group1] = [ Shift_L, Shift_Lock ]
  };
};
// Toggle ShiftLock when pressed together with the other Shift key.
partial modifier_keys
xkb_symbols "rshift_both_shiftlock" {
  key <RTSH> {
    type[Group1]="TWO_LEVEL",
    symbols[Group1] = [ Shift_R, Shift_Lock ]
  };
};
partial modifier_keys
xkb_symbols "both_shiftlock" {
  include "shift(lshift_both_shiftlock)"
  include "shift(rshift_both_shiftlock)"
};