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<p>A polymorphic object algebra for an object-oriented database model is introduced. Types of schema modification that follow naturally from this model are described. It is shown to what extent queries return identical or equivalent results when the objects in the database are modified to conform to a modified schema.</p>
polymorphism; schema evolution; object-oriented database; polymorphic object algebra; model; database management systems; database theory; object-oriented programming

S. Osborn, "The Role of Polymorphism in Schema Evolution in an Object-Oriented Database," in IEEE Transactions on Knowledge & Data Engineering, vol. 1, no. , pp. 310-317, 1989.
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