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

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Chapter 6. Modeling Transformations

Introduction

The transformation schema models a system as an active entity — as a network of activities that accept and produce data and control messages (and sometimes material or energy). In this chapter we will introduce the notation for the transformation schema, give some examples of its use, and describe the guidelines for assessing the consistency and the communicational quality of the model.

The transformation schema is based on the notation for data flow diagrams proposed by DeMarco [1] with substantial extensions to improve its rigor and representational ability.

The static view

Before looking at the active nature of the transformation schema, let’s use it to portray some static relationships.

Consider ...

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