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Building Distributed Real-Time Embedded systems requires a stringent methodology, from early requirements capture to full implementation. However, there is a strong link between the requirements and the final implementation (eg scheduling, resource dimensioning). Therefore, a rapid prototyping process based on automation of tedious and error-prone tasks (analysis, code generation) is required to speed up the development cycle. In this article, we show how the AADL (Architecture, Analysis and Description Language), appeared late 2005, helps solving these issues thanks to a dedicated tool-suite. We then detail the prototyping process and its current implementation: Ocarina.