This file is indexed.

/usr/share/X11/xkb/keymap/macintosh 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 xkb_keymap "macintosh" {
    xkb_keycodes	{ include "macintosh"				};
    xkb_types		{ include "default"				};
    xkb_compatibility	{ include "default"				};
    xkb_symbols		{ include "macintosh_vndr/us(extended)"		};
    xkb_geometry	{ include "macintosh"				};
};

xkb_keymap "macintosh_old" {
    xkb_keycodes	{ include "macintosh(old)"				};
    xkb_types		{ include "default"				};
    xkb_compatibility	{ include "default"				};
    xkb_symbols		{ include "macintosh_vndr/us(extended)"		};
    xkb_geometry	{ include "macintosh"				};
};