There are no examples in the manual and every file I've tried needs some geometry.
$ xkbcomp /usr/share/X11/xkb/symbols/ua tmp/ua.xkm
$ xkbprint tmp/ua.xkm
Cannot open "tmp/ua.xkm" to read geometry
$ xkbprint /usr/share/X11/xkb/symbols/ua
Error: Couldn't read geometry from XKM file "/usr/share/X11/xkb/symbols/ua"
Exiting