Jens Schönborn

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UML 2.0, which is the standard modeling language for objectoriented systems, has only an informally given semantics. This is in particular the case for UML 2.0 state machines, which are widely used for modeling the reactive behavior of objects. In this paper, a list of 29 newly detected trouble spots consisting of ambiguities, inconsistencies, and(More)
UML has become the standard modeling language for object-oriented systems. The informal description of UML and its continuous extension cause many ambiguities. Therefore, a formal semantics for UML is necessary, especially for formal reasoning and tool development. We present a formal semantics of UML 2.0 state machines, which are used for modeling the(More)
Modeling languages usually support two kinds of nondeterminism, an external one for interactions of a system with its environment, and one that stems from under-specification as familiar in models of behavioral requirements. Both forms of nondeterminism are resolvable by composing a system with an environment model and by refining under-specified behavior(More)
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