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Extra resources for Datalog Reloaded: First International Workshop, Datalog 2010, Oxford, UK, March 16-19, 2010. Revised Selected Papers
However, integrating the two families of logics is a challenging problem, as witnessed by the large number of approaches to hybrid frameworks. A major problem is that the naive approach—consisting in extending DLs with Datalog rules under classical first-order semantics—makes reasoning undecidable. Further difficulties arise from the need of integrating a classical open-world formalisms such as DLs with logic programming languages that are nonmonotonic and adopt a closed-world semantics. Solutions range from “loosely coupled” formalisms such as [40,88] (where the rule-based and DL parts of the knowledge base are treated like separate components that interact by querying each other) to fully integrated approaches (where the vocabulary and semantics are homogeneous) [69,34,50].
Policy comparison is definitely difficult for Datalog policies, because of recursion. It is well-known that Datalog query containment is in general undecidable . Several decidable cases have been identified by restricting recursion [28,15] but complexity may be high. , certificate chains and authorization inheritance) has been published in . The experimental results, based on a prototype implementation, are encouraging. In general, this restricted version of the problem is NP-complete; if rule length is bounded by a constant, then policy comparison is quadratic in the cardinality of the two policies.
Log. Program 15(3), 231– 241 (1993) 82. : Web explanations for semantic heterogeneity discovery. , Euzenat, J. ) ESWC 2005. LNCS, vol. 3532, pp. 303–317. Springer, Heidelberg (2005) 83. : The Art of Prolog - Advanced Programming Techniques, 2nd edn. MIT Press, Cambridge (1994) 84. : Explanations in knowledge systems: The roles of the task structure and domain functional models. IEEE Expert: Intelligent Systems and Their Applications 6(3), 50–57 (1991) 85. : KAoS policy and domain services: Towards a description-logic approach to policy representation, deconfliction, and enforcement.