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Extra info for Recent Trends in Data Type Specification: 3rd Workshop on Theory and Applications of Abstract Data Types Selected Papers

Example text

There is another layer on top of the object layer, specifying the state-dependent operations or "transactions". These consist of aggregate functions like average or minimal salary of persons in the database state, and state changing operations like insert, delete and update. We will not consider transactions here, but concentrate on data and object layers. Attributes and Relationships are uniformly modelled in the functional approach to data modelling [BF79, Shall. We adopt this approach, since it opens the way for applying algebraic concepts to the object level.

Having a theoretically well founded and usefull specification methodology for data and objects, however, is only a first step towards the ultimate goal of establishing software correctness and reliability. The logical next step is to elaborate the transaction layer and see how the database constraints can be taken into consideration and, hopefully, be enforced there. Here again, we have another specification problem that might require different concepts and techniques. 27 References BF79 CCF82 CF82 DMW82 EKW78 ELG84 EM85 GMS83 K183 KMS85 Ku84 LEG85 MP79 RU71 Se80 Sh81 TL82 Buneman, P.

W. Algebraic specifications with generating constraints. Proc. 10th ICALP, Barcelona. Springer LNCS 154, pp. 188-202. -C. Orsay. A. M. CAT, a system for the structured elaboration of correct programs from structured specifications. Technical report CSL-118, Computer Science Laboratory, SRI International. A. M. Introducing institutions. Proc. Logics of Programming Workshop, Carnegie-Mellon. Springer LNCS 164, pp. 221-256. V. The specification and application to programming of abstract data types.

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