Istituto di Scienza e Tecnologie dell'Informazione     
Asirelli P., Renso C., Turini F. The constraint operator of MedLan: its efficient implementation and use. In: IFIP TC11 Working Group 11.5. Second Working Conference on Integrity and Internal Control in Information Systems: Bridging Business Requirements and Research Results. (Warrenton, Virginia, USA, ). Proceedings, pp. 41 - 55. S. Jajodia et al. (eds.). Kluwer, 1998.
A declarative mediator language, based upon operations among logis theories is introduced. In particular we concentrate on the constraint operator. The denotational semantics of the language is introduced together with the definition of a bottom-up efficient implementation. The use of the constraint operator for security within a mediator architecture for database integration is suggested and presented by means of a simple example.
Subject database integration
multilevel security
internal security

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