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Formal Semantics for Ward & Mellor's TRANSFORMATION SCHEMA's and its Application to Fault-Tolerant Systems

A family of formal semantics is given for the Essential Model of the Transformation Schema of Ward & Mellor using recent techniques developed for defining the semantics of Statecharts by Pnueli and Huizing. A number of ambiguities and inconsistencies in Ward & Mellor's original definition is resolved. The models developed closely resemble those used for synchronous languages. Each model has its own application area, e.g., one fits best for fault-tolerant systems.

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