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The default form of referring to a class instance (object) is to give its class name and its object identifier. However, due
to the strong typing of the MOF, there are many situations in which the references will always be to a known class and hence
the class name can be omitted.
There are three situations when this shorthand can be used; in a MOF Reference, in an attribute where the type of the attribute
is an instance of a local MOF class, and in the representation of an association. Each of these is subject to two conditions.
If the object that is being referred to is contained by the referring object, then the referred object may be represented
as a declaration rather than a reference and, in this case, its type name may not be omitted.
The second condition is that the referred class and all of its subclasses must use a consistent identification scheme, either
by all using the same attribute as an identifying attribute, or all arbitrary unique identifiers. Without this condition,
the risk would be introduced of having two objects with the same identifying string.