UML14 — "Physical" Metamodel Package Structure (uml-rtf)

The package structure of UML 1.3 makes it difficult to deploy small parts of
the "physical" metamodel separately. For example, a MOF-based facility that
supports classes from Behavioral_Elements.Common_Behavior must support all
of Behavioral_Elements. A facility that supports Exceptions must also
support Use Cases and State Machines. This has been a problem in the
formation of the CWM metamodel which extends UML. Its interfaces and DTDs
are made to be much too large.

The result of UML currently having three metamodels (two of which are large)
rather than many smaller metamodels is that the IDL modules are very large
and so are the DTDs. Breaking the metamodels into several smaller ones will
allow smaller interface sets and DTDs that can be mixed and matched to
provide necessary functionality without a huge overhead.

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