Many approaches such as component technologies have been invented in order to support software reuse. Based on these technologies a large variety of techniques have been introduced to connect components. However, there is little experience concerning the validation of component systems. We know how to plug components together, but we do need ways to check whether that works. In this paper we introduce an approach to validating component compositions and showing how such a process can be supported by tools. We introduce a way to compare the interface specification of components automatically against the code. Furthermore, we demonstrate how compositions of components can be specified by logical formulas, allowing us to automatically validate these compositions.
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The process of modelling and developing commonality and variability for system families should be supported by suitable methods and notations. The object-oriented methods and their notations, which are used at present, focus on the development of a single system at a time. In this paper we analyse feature models as a representation of the common parts and variants contained in a system family, and propose using a feature diagram as a basic representation of commonality, variability and dependencies. We examine various approaches to customizing the standard modelling language UML to model system families and propose how to extend the UML for the purposes of modelling variants in object-oriented analysis and design techniques. We recommend the use of UML standard lightweight extensibility mechanisms (stereotypes combined with tagged values) without changing the UML metamodel. This enables us to join the advantages of feature models with UML and provides the traceability of a concept throughout system development. An application of lightweight UML extension mechanisms allows the existing standard UML modelling tools to be used without any adaptations. An example of an application illustrates our approach.
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