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The use of the [odd] element for the nationality of an individual person
seems to me not the best solution. The element [odd] and [persname] or
[famname] can not be used as siblings. If you use these elements together,
the EAD instance will not be valid or very complex.
EAD nor EAC CPF have elements or attributes dedicated to this type of
information. Although EAC CPF has been developed for the description of
persons, you can use the [name] elements in an EAD instance, e.g. as childs
of the element [controlaccess]. The nationality information you could mark
with [geogname role="nationality"].
Henny van Schie
Den Haag NL