Matches in ScholarlyData for { ?s ?p ?o. }
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- item-1 hasContent olaf-hartig.
- 40 creator francois-picalausa.
- 40 creator george-h-l-fletcher.
- 40 creator jan-hidders.
- 40 creator stijn-vansummeren.
- 40 creator yongming-luo.
- 40 type InProceedings.
- 40 label "A Structural Approach to Indexing Triples".
- 40 sameAs 40.
- 40 abstract "As an essential part of the W3C’s semantic web stack and linked data initiative, RDF data management systems (also known as triplestores) have drawn a lot of research attention. The majority of these systems use value-based indexes (e.g., B+-trees) for physical storage, and ignore many of the structural aspects present in RDF graphs. Structural indexes, on the other hand, have been successfully applied in XML and semi-structured data management to exploit structural graph information in query processing. In those settings, a structural index groups nodes in a graph based on some equivalence criterion, for example, indistinguishability with respect to some query workload (usually XPath). Motivated by this body of work, we have started the SAINT-DB project to study and develop a native RDF management system based on structural indexes. In this paper we present a principled framework for designing and using RDF structural indexes for practical fragments of SPARQL, based on recent formal structural characterizations of these fragments. We then explain how structural indexes can be incorporated in a typical query processing workflow; and discuss the design, implementation, and initial empirical evaluation of our approach.".
- 40 hasAuthorList authorList.
- 40 isPartOf proceedings.
- 40 keyword "RDF management systems".
- 40 keyword "query processing".
- 40 keyword "structural indexes".
- 40 title "A Structural Approach to Indexing Triples".
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- item-1 hasContent francois-picalausa.
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- item-2 hasContent yongming-luo.
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- item-5 hasContent stijn-vansummeren.
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- 41 creator mark-sandler.
- 41 creator yves-raimond.
- 41 type InProceedings.
- 41 label "Evaluation of the Music Ontology framework".
- 41 sameAs 41.
- 41 abstract "The Music Ontology provides a framework for publishing structured music-related data on the Web, ranging from editorial data to temporal annotations of audio signals. It has been used extensively, for example in the DBTune project and on the BBC Music website. Until now it hasn’t been systematically evaluated and compared to other frameworks for handling music-related data. In this article, we design a ‘query-driven’ ontology evalution framework capturing the intended use of this ontology. We aggregate a large set of real-world music-related user needs, and evaluate how much of it is expressible within our ontological framework. This gives us a quantitative measure of how well our ontology could support a system addressing these real-world user needs. We also provide some statistical insights for comparison with related description frameworks and identify areas within the ontology that could be improved.".
- 41 hasAuthorList authorList.
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- 41 keyword "evaluation".
- 41 keyword "music".
- 41 keyword "ontology".
- 41 title "Evaluation of the Music Ontology framework".
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- item-1 hasContent yves-raimond.
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- item-2 hasContent mark-sandler.
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- 47 creator boris-motik.
- 47 creator despoina-magka.
- 47 creator ian-horrocks.
- 47 type InProceedings.
- 47 label "Modelling Structured Domains Using Description Graphs and Logic Programming".
- 47 sameAs 47.
- 47 abstract "OWL 2 is widely used to describe complex objects such as chemical molecules, but cannot represent `structural' features of chemical entities such as having a ring. Adding rules, and description graphs (DGs) has been suggested as a possible solution, but still exhibits several drawbacks. We present a radically different approach that we call Description Graph Logic Programs. Syntactically, our approach combines DGs, rules, and OWL 2 RL axioms, but the semantics is via a translation into logic programs interpreted under stable model semantics. The result is an expressive OWL 2 RL-compatible formalism that is well suited for modelling objects with complex structure.".
- 47 hasAuthorList authorList.
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- 47 keyword "knowledge representation".
- 47 keyword "logic programs with function symbols".
- 47 keyword "non-monotonic reasoning".
- 47 title "Modelling Structured Domains Using Description Graphs and Logic Programming".
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- item-1 hasContent despoina-magka.
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- item-2 hasContent boris-motik.
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- item-3 hasContent ian-horrocks.
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- 48 creator danica-damljanovic.