Abstract
We present an overview and synthesis of existing results about process algebras for the specification and analysis of timed systems. The motivation is double: present an overview of some relevant and representative approaches and suggest a unifying framework for them. After presenting fundamental assumptions about timed systems and the nature of abstract time, we propose a general model for them: transition systems whose labels are either elements of a vocabulary of actions or elements of a time domain. Many properties of this model are studied concerning their impact on description capabilities and on realisability issues. An overview of the language features of the process algebras considered is presented, by focusing on constructs used to express time constraints. The presentation is organised as an exercise of building a timed process algebra from a standard process algebra for untimed systems. The overview is completed by a discussion about description capabilities according to semantic and pragmatic criteria.
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