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

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Chapter 8. Specifying Data Transformations

Introduction

The graphic representation used in a transformation schema is not sufficient to produce a rigorous description of a data transformation. The schema represents the inputs to and outputs from the data transformation, but the only description of the transformation’s behavior is its name. In a simple transformation such as shown in Figure 8.1, the omission of details about the transformation isn’t much of a problem; its behavioral requirements are intuitively obvious. Figure 8.2 presents a completely different situation. The transformation must schedule a series of machine operations to produce a quantity of some finished product. The schedule must not conflict with existing schedules and must ...

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