|E51-CIDOC - This class comprises identifiers used to communicate with instances of E39 Actor. These include E-mail addresses, telephone numbers, post office boxes, Fax numbers, etc. Most postal addresses can be considered both as instances of E44 Place Appellation and E51 Contact Point.
++Philosurfical: I guess this is left partially open, so to let users adapt it to their needs...
Class(CONTACT-POINT partial PERSISTENT-ITEM)
Class Description/Definition (Necessary Conditions)