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      Investigating Extension Polymorphism

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      Proceedings of the Fifth International Workshop on Database Programming Languages (DBPL-5)

      Database Programming Languages

      6-8 September 1995

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          Abstract

          This paper examines a polymorphism mechanism which allows abstraction over evolving types. Although inclusion polymorphism is often quoted as being such a mechanism, this holds only for record types, for which constructor the inclusion relation matches the way types evolve in a long-lived system. This paper formalises the idea of evolution in the type space by the notion of extension, based upon both intuition and observation of evolving systems in a persistent programming environment. Extension is proposed as a type abstraction mechanism to allow smooth evolution in statically typed systems, and programming language mechanisms are introduced which maintain soundness and static checking in the presence of this abstraction. Extension over some function types is related to the concept of type matching, but a more general treatment is given as our interest is in extension over the whole type system.

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          Orthogonally persistent object systems

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            Using persistence technology to control schema evolution

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              Type hierarchies and Semantic Data Models

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                Author and article information

                Conference
                September 1995
                September 1995
                : 1-11
                Affiliations
                School of Mathematical and Computational Sciences,

                University of St Andews, St Andrews, Fife, Scotland KY16 9SS
                Article
                10.14236/ewic/DBPL1995.7
                © Richard Connor et al. Published by BCS Learning and Development Ltd. Proceedings of the Fifth International Workshop on Database Programming Languages, Gubbio, Umbria, Italy

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Proceedings of the Fifth International Workshop on Database Programming Languages
                DBPL-5
                5
                Gubbio, Umbria, Italy
                6-8 September 1995
                Electronic Workshops in Computing (eWiC)
                Database Programming Languages
                Product
                Product Information: 1477-9358BCS Learning & Development
                Self URI (journal page): https://ewic.bcs.org/
                Categories
                Electronic Workshops in Computing

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