Download Datalog Reloaded: First International Workshop, Datalog by María Alpuente, Marco Antonio Feliú, Christophe Joubert, PDF

By María Alpuente, Marco Antonio Feliú, Christophe Joubert, Alicia Villanueva (auth.), Oege de Moor, Georg Gottlob, Tim Furche, Andrew Sellers (eds.)

This ebook constitutes the completely refereed post-workshop court cases of the 1st foreign Workshop on Datalog 2.0, held in Oxford, united kingdom, in March 2010. The 22 revised complete papers provided have been rigorously chosen in the course of rounds of reviewing and enhancements from a number of submissions. The papers exhibit the cutting-edge in concept and structures for datalog, divided in 3 sections: homes, purposes, and extensions of datalog.

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Extra resources for Datalog Reloaded: First International Workshop, Datalog 2010, Oxford, UK, March 16-19, 2010. Revised Selected Papers

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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 [81]. 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 [21]. 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.

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