Istituto di Scienza e Tecnologie dell'Informazione     
Kim W., Bertino E., Garza J. F. Composite objects revisted. In: ACM SIGMOD 89 - International Conference on the Management of Data (Portland, Oregon, June 1989). Proceedings, vol. 18 pp. 337 - 347. J. Clifford and B. Lindsay and D. Maier (eds.). ACM Press, 1989.
In object-oriented systems, an object may recursively any number of other objects. The references, however, do not capture any special relationships between objects. An important semantic relationship which may be superimposed on a reference is the IS-PART-OF relationship between a pair of objects. A set of objects related by the IS-PART-OF relationship is collectively called a composite object.

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