For datum 5120, deleted alias and changed name from "Nivellement General de la France - IGN78" to "IGN78 Corsica". Changed alias "NGF" to "IGN78"; deleted alias remarks. Added comment on supersession to remarks. Added datum 5189. For CRS 5721, deleted changed name from "NGF IGN78" to "IGN78 Corsica". Added comment on supersession to remarks. Added datum 5189, CRS 5791.