The author takes a particular approach to the semantics of specification languages, and the understanding that the meaning of specification can be taken as presentations of logical theories is fundamental to that approach. An extension of the specification language VDM-SL is introduced and its formal semantics are presented. The practical use of this language is further demonstrated by two detailed case studies which provide a comprehensive picture of the relational approach to databases, and are useful reading for those employing formal specifications in software developments. Annotation copyright Book News, Inc. Portland, Or.
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