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This UML 2.0: Superstructure is the second of two complementary specifications that represent a major revision to the Object
Management Group’s Unified Modeling Language (UML), for which the most current version is UML v1.4. The first specification,
which serves as the architectural foundation for this specification, is the UML 2.0: Infrastructure.
This UML 2.0: Superstructure defines the user level constructs required for UML 2.0. It is complemented by UML 2.0: Infrastructure
which defines the foundational language constructs required for UML 2.0. The two complementary specifications constitute a
complete specification for the UML 2.0 modeling language.