Download e-book for kindle: Journal on Data Semantics X by Riccardo Albertoni, Monica De Martino (auth.), Stefano

By Riccardo Albertoni, Monica De Martino (auth.), Stefano Spaccapietra (eds.)

ISBN-10: 3540776877

ISBN-13: 9783540776871

• internet semantics and semi-structured information • Semantic caching • information warehousing and semantic info mining • Spatial, temporal, multimedia and multimodal semantics • Semantics in facts visualization • Semantic providers for cellular clients • aiding instruments • functions of semantic-driven methods those themes are to be understood as in particular with regards to semantic concerns. Contributions submitted to the magazine and working with semantics of information could be thought of whether they aren't from the themes within the checklist. whereas the actual visual appeal of the magazine concerns is just like the books from the we- identified Springer LNCS sequence, the mode of operation is that of a magazine. Contributions should be freely submitted by way of authors and are reviewed by way of the Editorial Board. Contributions can also be invited, and however rigorously reviewed, as within the case for matters that include prolonged models of most sensible papers from significant meetings addressing facts semantics concerns. designated concerns, targeting a particular subject, are coordinated by way of visitor editors as soon as the concept for a different factor is authorized via the Editorial Board. eventually, it's also attainable magazine factor be dedicated to a unmarried textual content. The Editorial Board includes an Editor-in-Chief (with total responsibility), a Co-editor-in-Chief, and several other participants. The Editor-in-Chief has a four-year mandate. contributors of the board have a three-year mandate. Mandates are renewable and new individuals might be elected anytime.

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We introduce a notion of query relaxation based on RDFS entailment, which naturally incorporates RDFS ontologies and captures necessary information for relaxation such as the class and property hierarchies. By formalizing query relaxation in terms of entailment, we obtain a semantic notion which is by no means limited to RDFS and could also be extended to more expressive settings such as OWL entailment and OWL ontologies, to capture further relaxations. Our framework generalizes, for the conjunctive fragment of SPARQL, the idea of dropping query conditions provided by the OPTIONAL construct.

A,sp,b) (a,sp,b) (e1) (b,dom,c) (e2) (b,range,c) (a,dom,c) (a,range,c) (b,sc,c) (b,sc,c) (e3) (a,dom,b) (e4) (a,range,b) (a,dom,c) (a,range,c) Fig. 7. Additional rules used to compute the extended reduction of an RDFS ontology The proposition shows that we can avoid generating indirect relaxations by further reducing the ontology with the rules of Figure 7, which yields an extended reduction of an ontology O. The extended reduction, denoted extRed(O), is defined as follows: (i) compute cl(O); (ii) apply the rules of Figure 7 in reverse until no longer applicable; (iii) apply rule 4 in reverse until no longer applicable; and (iv) apply rules 1 and 3 in reverse until no longer applicable.

An . A. Hurtado, A. T. Wood D D sc C dom sc sc dom sc C C dom sc A D B (A) sc A B dom (B) sc A dom (C) B Fig. 5. (A) An ontology O. (B) The reduction red(O) of O. (C) The extended reduction extRed(O) of O. tuples in ranked order if (i) the set {a1 , . . , an } is equal to Qi :Q≤Q Qi ans(Qi , G), and (ii) for all pairs of queries Qi , Qj such that Qi ≺Q Qj , the new answers of Qi appear earlier in L than the new answers of Qj . 4 Computing the Relaxation Graph In this section, we study the problem of computing the relaxation graph of a triple pattern.

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Journal on Data Semantics X by Riccardo Albertoni, Monica De Martino (auth.), Stefano Spaccapietra (eds.)


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