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Structured Development for Real-Time Systems by Stephen J. Mellor, Paul T. Ward

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Chapter 11. Specifying Data

Introduction

The flows and stores on the transformation schema and the object types and relationships on the data schema declare components that must be specified precisely. These components can all be regarded as data items, although they appear in several different forms on the two schemas. We must now address the problem of the specification of these components, so that we can produce a rigorous model.

Before we plunge into the details of these specifications, let us first establish a framework for the major issues that need to be addressed. Data has three aspects — meaning, composition and type — that are commonly confused. To get a clear picture of data we need to think about each aspect separately; each of the next ...

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