
Business Process Modeling ◾ 189
both defined as part of the UML metamodel. ese are instantiated in a user model in such a way
that the classes Person and Car are both instances of the metaclass Class, and the association Person.
car between the classes is an instance of the metaclass Association. e semantics of UML defines
what happens when the user-defined model elements are instantiated at M0, and we get an instance
of Person, an instance of Car, and a link (i.e., an instance of the association) between them.
e instances—sometimes referred to as runtime instances—that are created at M0 from, for
example, Person should not be confused with in ...