This file is indexed.

/usr/share/X11/xkb/semantics/basic is in xkb-data 2.5.1-3.

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_semantics "basic" {

xkb_types		{ include "basic" 	};
xkb_compatibility	{ include "basic"	};

};