Specifying Component and Context Specification Using Promotion

In this paper we discuss how the speciication of components may be separated from the description of the context in which they are used. There are a number of ways in which this might be possible and here we show how to use the technique of promotion in Object-Z to combine components which are speciied using process algebras. We discuss two approaches, the rst is to separate out the speciica-tion into two distinct viewpoints written in diierent languages. These viewpoints are then combined by a process of translation and uniica-tion. The second approach will be to use hybrid languages composed of a combination of CSP and Object-Z. We also consider how to reene such component based descriptions and consider issues of compositionality.