We present work on a formal model for the composition of object-oriented modules, or hyperslices, which represent different perspectives on the system being built. With the model, we should be able to study existing approaches such as subject-oriented programming, as well as extend other object-oriented languages, such as the UML, to accommodate the use of hyperslices. We how here a sample of the specification language that accompanies the formal model, and a small example of its use.
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