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Abstract. We present in this paper a technique and a tool for validating operational UML models by simulation and verification of dynamic properties. With respect to language coverage, our approach takes into consideration most of the structural and behavioral characteristics of classes and their interplay. We tackle issues like the combination of operations, state machines, inheritance and polymorphism, with a particular run-tocompletion and concurrency semantics. This is an important point, as many previous approaches applying model checking to UML put limiting conditions on the models. The UML dialect considered here also includes a set of extensions for expressing timing, which were defined in detail in [18]. For writing properties about models, we introduce UML observer objects. Observers are both easy to use -they reuse existing concepts of UML, and powerful -they are equivalent to linear temporal logic. Our approach is implemented by a tool built on top of an XMI repository. The tool is connected to several commercial and non-commercial UML editors, and to other model checking tools.

We describe an approach to support UMLbased development of embedded systems by formal techniques. A subset of UML is extended with timing annotations and given a formal semantics. UML models are translated, via XMI, to the input format of formal tools, to allow timed and non-timed model checking and interactive theorem proving. Moreover, the Play-Engine Communicated by Dr. Susanne Graf.This work has been supported by EU-project IST 33522 -OMEGA "Correct Development of Real-Time Embedded Systems in UML". For more information, see http://www-omega.imag.fr/. During this project, the second author was at the Weizmann Institute of Science, the third author at VERIMAG, the fourth author at OFFIS, and the fifth author at NLR.

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Abstract. Starting from version 2.0, UML introduced hierarchical composite structures, which are a very expressive way of defining complex software architectures, but which have a very loosely defined semantics in the standard. In this paper we propose a set of consistency rules that ensure UML composite structures are unambiguous and can be given a precise semantics. Our primary application of the static consistency rules defined in this paper is within the OMEGA UML profile [6], but these rules are general and applicable to other hierarchical component models based on the same concepts, such as MARTE GCM or SysML. The rule set has been formalized in OCL and is currently used in the OMEGA UML compiler.