R5

R5 / 1:Mc

Modeled Domain declares zero, one or many External Entity

External Entity is declared in exactly one Modeled Domain

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An External entity declares an External Entity to serve as a proxy for either services or requirements defined in some other Domain.

One Domain may play the role of a service to multiple client domains. One or more separate EE's would then be declared in each such client Domain.

Also, a single client or service Domain may be declared as multiple distinct proxies in the same external Domain.

A Modeled Domain that does not interact with any other Domain will not have any External Entities declared.

Formalization

External Entity.Domain -> Modeled Domain.Name