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<p>The authors describe how the characteristics of an object-oriented data model, such as object identity, complex object structure, methods, and class hierarchies, have an impact on the design of a query language. They also point out major differences with respect to relational query languages. The discussion is supported through the definition of OOPC, a formal object-oriented query language based on predicate calculus, which incorporates in a consistent formal notation most features of existing object-oriented query languages.</p>
object identity; complex object structure; class hierarchies; OOPC; predicate calculus; formal notation; object-oriented databases; query languages

M. Negri, L. Sbattella, E. Bertino and G. Pelagatti, "Object-Oriented Query Languages: The Notion and the Issues," in IEEE Transactions on Knowledge & Data Engineering, vol. 4, no. , pp. 223-237, 1992.
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