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

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

This publication constitutes the completely refereed post-workshop court cases of the 1st overseas 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 variety of submissions. The papers exhibit the state of the art in thought and platforms for datalog, divided in 3 sections: homes, purposes, and extensions of datalog.

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Springer, Heidelberg (2004) 89. : Second generation expert system explanation. , Simmons, R. ) Second Generation Expert Systems, pp. 614–640. Springer, Heidelberg (1993) 90. : Automated trust negotiation. In: Proceedings of DARPA Information Survivability Conference and Exposition, DISCEX 2000, pp. 88–102. IEEE Computer Society, Los Alamitos (2000) 91. : Authorizations in distributed systems: A new approach. Journal of Computer Security 2(2-3), 107–136 (1993) 92. : Using description logics in relation based access control.

The RT family [62] has an ad-hoc rule language for manipulating credentials that encode roles and permissions. RT’s semantics, however, is specified by a translation into Datalog. Cassandra [12] is a TN framework based on Datalog with constraints. In Cassandra, atoms are labelled with a location where the atom holds, and with an issuer that digitally signs the atom (thereby certifying that inference). PeerTrust [45] is a Datalog dialect with atom annotations expressing locations and signatures analogous to Cassandra’s.

1 Datalog-Based Approaches Nonmonotonic semantics is fundamental for policy languages, that need to encode default policies such as open and closed policies (where authorizations are granted or denied—respectively—unless stated otherwise), authorization inheritance with exceptions (which is helpful to formulate policies incrementally, by iterative refinements, and supports exception handling, such as user blacklisting for crisis management), and prioritized conflict resolution. The initial approach by Woo and Lam [91], based on general default logic, has been later refined into a framework called Flexible Authorization Framework (FAF) [56], based on stratified Datalog with negation.

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