. . . . . . . . "The rules you provide as constraints to be checked for your baseline approach (p.22) are sometimes questionable. As e.g., Persons without a birthdate (even if they sometimes have a deathdate) - this holds for many historical persons born a long time ago, simply because their birthdate is not known." . "3"^^ . . . . "2019-11-26T09:05:11+01:00"^^ . .