Abstract

A multilevel relational database represents information in a multilevel state of the world, which is the knowledge of the truth value of a statement with respect to a classification level in a security lattice. We develop a model-theoretic semantics of the multilevel relational model with tuplelevel classification, which formalizes the notion of validity in multilevel relational databases. We also identify the multilevel security constraints that precisely characterize the validity of multilevel relational databases.

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