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In contrast to UML 1, UML 2 includes not only one but four specifi cation documents.
The language is described in Superstructure [48]. It is based on a core that
is defi ned in the infrastructure [51]. Moreover, UML includes another language??”
the Object Constraint language ( OCL )??”that has been described in a separate
document since UML 2 [52]. And the XML Metamodel Interchange (XMI) Metadata
Interchange format [64] has been around since UML 1. XMI allows you to exchange
UML model between different tools. A new data format for diagrams (Diagram
Interchange [50]) was introduced together with UML 2; it lets you exchange the
diagram level, in addition to the model level, between different tools.
UML is defi ned in a modular way. You can work with parts of the language.
For example, you don ??™ t have to deal with class modeling when all you want to do
is an analysis of your use cases. The criticized point, that UML was too large and
too extensive a language is unjustifi ed. It is not necessary to realize all modeling
possibilities UML offers in one project.


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