Simon R. Monk, Ian Sommerville. A Model for Versioning of Classes in Object-Oriented Databases. In Peter M. D. Gray, Robert J. Lucas, editors, Advanced Database Systems, 10th British National Conference on Databases, BNCOD 10, Aberdeen, Scotland, July 6-8, 1992, Proceedings. Volume 618 of Lecture Notes in Computer Science, pages 42-58, Springer, 1992.
This paper describes work carried out on a model for the versioning of class definitions in an Object-oriented database. By defining update and backdate functions on attributes of the previous and current version of a class definintion, instances of any version of the class can be converted to instances of any other version. This allows programs written to access an old version of the schema to still use data created to a changed schema.