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Abstract. Throughout the years, many model description languages have been used in different model-based testing tools, however, all these languages are quite unfamiliar to test engineers. In this paper, we propose TTCN-3 (Testing and Test Control Notation 3), the nowadays most popular and widely spread test definition language to be used for this purpose and give two alternative approaches how this could be carried out. TTCN-3 as modelling language can support test generation tools by means of the annotations we introduce in the paper.

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