What explicit data is required by GEDCOM but only implicit in FO?
All event structures as defined above will either exist or not exist for a given individual or family. In GEDCOM 4.0 the existence of an event name implied that the event exists for the given person or family. In GEDCOM 5.0 and above this is not true! An event exists if there is a Y after the event name or a date or place is given for the event. You could have a note or source about an event without implying the event exists according to GEDCOM 5.5. I can’t defend this but that is the way it is written. Importing BK files would break if FO enforced this rule on input but I would like to see conformance with the rule on output. FO currently works like BK.
