By Franz Baader (auth.), Sergio Tessaris, Enrico Franconi, Thomas Eiter, Claudio Gutierrez, Siegfried Handschuh, Marie-Christine Rousset, Renate A. Schmidt (eds.)

ISBN-10: 3642037534

ISBN-13: 9783642037535

ISBN-10: 3642037542

ISBN-13: 9783642037542

This publication incorporates a selection of seven completely revised instructional papers in response to lectures given through prime researchers on the fifth overseas summer season university at the Reasoning internet, held in Brixen-Bressanone, Italy, from August 30 to September four, 2009. the target of the publication is to supply a coherent advent to semantic internet equipment and learn concerns with a specific emphasis on reasoning.

The concentration of this year’s occasion was once at the use of semantic applied sciences to reinforce facts entry on the internet. themes coated contain layout and research of reasoning techniques for description logics; resolution set programming fundamentals, its modeling technique and its crucial extensions adapted for semantic net functions; languages for constraining and querying XML facts; RDF database thought and effective and scalable help for RDF/OWL facts garage, loading, inferencing and querying; tractable description logics and their use for ontology-based info entry; and the social semantic computer, which defines a user’s own details setting as a resource and end-point of the semantic web.

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Extra info for Reasoning Web. Semantic Technologies for Information Systems: 5th International Summer School 2009, Brixen-Bressanone, Italy, August 30 - September 4, 2009, Tutorial Lectures

Example text

For example, all early systems used expansion of concept definitions, which can cause an exponential blow-up of the size of concepts. t. TBoxes showed that this blow-up cannot be avoided whenever the constructors conjunction and value restriction are available. , they were not able to detect all valid subsumption relationships. These negative results for structural subsumption algorithms together with the advent of tableau-based algorithms for expressive DLs, which behaved well in practice, was probably the main reason why structural approaches—and with them the quest for DLs with a polynomial subsumption problem—were largely abandoned during the 1990s.

The k-ary Q-tree R from the right-hand side of Fig. 8 maps ε to q0 , nodes starting with 0 to q1 , and nodes starting with 1 to q2 . This tree R is an accepting run of A on the tree T on the left hand side of Figure 8. Description Logics 25 The tree language accepted by a given looping automaton A = (Q, Σ, I, Δ) is L(A) := {T : {0, . . , k − 1}∗ → Σ | there is an accepting run of A on T }. In our example, the language accepted by the automaton consists of two trees, the tree T defined above and the symmetric tree where the left subtree contains only nodes labelled with a and the right subtree contains only nodes labelled with b.

IJCAR 2001. LNCS (LNAI), vol. 2083, pp. 701–706. Springer, Heidelberg (2001) 63. : Proof-theoretic approach to description-logic. In: Panangaden, P. ) Proc. of the 20th IEEE Symp. on Logic in Computer Science (LICS 2005), pp. 229–237. IEEE Computer Society Press, Los Alamitos (2005) 64. : Consistency checking reduced to satisfiability of concepts in terminological systems. Ann. of Mathematics and Artificial Intelligence 18(2–4), 133–157 (1996) 65. : Qualifying number restrictions in concept languages.

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Reasoning Web. Semantic Technologies for Information Systems: 5th International Summer School 2009, Brixen-Bressanone, Italy, August 30 - September 4, 2009, Tutorial Lectures by Franz Baader (auth.), Sergio Tessaris, Enrico Franconi, Thomas Eiter, Claudio Gutierrez, Siegfried Handschuh, Marie-Christine Rousset, Renate A. Schmidt (eds.)


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