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ACM Transactions on Information Systems (TOIS)
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OOPSLA '87 Conference proceedings on Object-oriented programming systems, languages and applications
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Lecture notes in computer science on Advances in object-oriented database systems
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ACM Transactions on Database Systems (TODS)
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ACM Transactions on Database Systems (TODS)
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ACM SIGMOD Record
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ACM Transactions on Database Systems (TODS)
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ACM Computing Surveys (CSUR)
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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.