CORBA24 — USING Components::Enumeration

It is probably not a good idea to mandate an implementation for
Enumeration, since there may be different options for implementing.
For example, it may be desirable for
performance reasons to implement a form of lazy Enumeration that does
not carry with it every element that it can contain, but requiring
this kind of implementation can be overkill for some
applications. Given this, Enumeration is defined as an abstract
valuetype and at least one concrete specialization of it is
required. In addition, FOR INTEROPERABILITY, at least one STANDARD
implementation must also be provided so that client stubs and server
skeletons know how to marshal and unmarshal Enumeration values.

resolution see above