A logical analysis of modules in logic programming
Journal of Logic Programming
IEEE Transactions on Software Engineering
Toward a multilevel secure relational data model
SIGMOD '91 Proceedings of the 1991 ACM SIGMOD international conference on Management of data
Logical foundations of object-oriented and frame-based languages
Journal of the ACM (JACM)
Asserting beliefs in MLS relational models
ACM SIGMOD Record
Belief reasoning in MLS deductive databases
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Foundations of Secure Deductive Databases
IEEE Transactions on Knowledge and Data Engineering
Querying a Multilevel Database: A Logical Analysis
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Implementing Abstract Objects with Inheritance in Datalogneg
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
A Logical Language for Expressing Authorizations
SP '97 Proceedings of the 1997 IEEE Symposium on Security and Privacy
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The impetus for our current research is the need to provide an adequate framework for belief reasoning in multi-level secure (MLS) databases. We demonstrate that a prudent application of the concept of inheritance in a deductive database setting will help capture the notion of declarative belief and belief reasoning in MLS databases in an elegant way. In this paper, we show that these concepts can be captured in a F-logic style declarative query language, called MultiLog, for MLS deductive databases for which a model theoretic semantics exists. This development is significant from a database perspective as it now enables us to compute the semantics of MultiLog databases in a bottom-up fashion. The semantics developed here is reminiscent of the stable model semantics of logic programs with negation. We also define a bottom-up procedure to compute unique models of stratified MultiLog databases. Finally, we also establish the equivalence of MultiLog's three logical characterizations - model theory, fixpoint theory and proof theory.