IEEE Transactions on Software Engineering
Formally Specifying and Verifying Real-Time Systems
ICFEM '97 Proceedings of the 1st International Conference on Formal Engineering Methods
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ASTRAL is a formal specification language for realtime systems. It is intended to support formal software development and, therefore, has been formally defined. The structuring mechanisms in ASTRAL allow one to build modularized specifications of complex systems with layering. A realtime system is modeled by a collection of state machine specifications and a single global specification. This paper discusses the rationale of ASTRAL''s design. ASTRAL''s specification style is illustrated by discussing a telephony example. Composability of one or more ASTRAL system specifications is also discussed by the introduction of a composition section, which provides the needed information to combine two or more ASTRAL system specifications into a single new one. Finally, this paper discusses the current status of the ASTRAL software development environment.