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Composability is a sought after property. However, whereas there is usually an intuitive understanding of this concept, a clear definition has been frequently missing.
In this paper, we refine our concept of composability given in. We see composability as a property of an architecture not of systems. In addition, we do not want to reduce composability to the functional specification; rather, we are focusing on how composability effects the nonfunctional properties, especially the composed system's real-time behavior, its reliability, its security, etc. We see the advantage of our approach in having a wide application domain. It works for functional and non-functional properties, it may consider both, hardware and software, and it allows for a description of composition anomalies.
In this paper, we show how to apply our concept to an embedded hardware-software co-designed architecture and to composition and decomposition of dependable services in embedded environments.