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An interface is a description of a set of possible operations that a client may request of an object, through that interface.
It provides a syntactic description of how a service provided by an object supporting this interface, is accessed via this
set of operations. An object satisfies an interface if it provides its service through the operations of the
interface according to the specification of the operations (see Section 1.2.8,
“Operations,? on page 1-7).
The interface type for a given interface is an object type, such that an object reference will satisfy the type, if and only
if the referent object also satisfies the interface.
Interfaces are specified in OMG IDL. Interface inheritance provides the composition mechanism for permitting an object to
support multiple interfaces. The principal interface is simply the most-specific interface that the object supports, and consists
of all operations in the transitive closure of the interface inheritance graph.
Interfaces satisfy the Liskov substitution principle. If interface A is derived from interface B, then a reference to an object
that supports interface A can be used where the formal type of a parameter is declared to be B.