Occasionally the term is extended to include models which "unify" different types in more general ways, e.g. by seeing them as different stages in a life-cycle.
(the term; is extended; to include models which "unify" different types in more general ways; T:Occasionally) (the term; to include; models which "unify" different types in more general ways)
the term the term
is extended to include
to include models which "unify" different types in more general ways T:Occasionally
models which "unify" different types in more general ways