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- 169 creator hans-joerg-happel.
- 169 type InProceedings.
- 169 label "Semantic Need: Guiding Metadata Annotations by Questions People #ask".
- 169 sameAs 169.
- 169 abstract "In its core, the Semantic Web is about the creation, collection and interlinking of metadata on which agents can perform tasks for human users. While many tools and approaches support either the creation or usage of semantic metadata, there is neither a proper notion of metadata need, nor a related theory of guidance which metadata should be created. In this paper, we propose to analyze structured queries to help identifying missing metadata. We conduct a study on Semantic MediaWiki (SMW), one of the most popular Semantic Web applications to date, analyzing structured "ask"-queries in public SMWinstances. Based on that, we describe Semantic Need, an extension for SMW which guides contributors to provide semantic annotations, and summarize feedback from an online survey among 30 experienced SMW users.".
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- 169 keyword "semantic web".
- 169 title "Semantic Need: Guiding Metadata Annotations by Questions People #ask".
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- 187 creator diego-calvanese.
- 187 creator dmitriy-zheleznyakov.
- 187 creator evgeny-kharlamov.
- 187 creator werner-nutt.
- 187 type InProceedings.
- 187 label "Evolution of DL-Lite Knowledge Bases".
- 187 sameAs 187.
- 187 abstract "We study the problem of evolution for Knowledge Bases (KBs) expressed in Description Logics (DLs) of the DL-Lite family. DL-Lite is at the basis of OWL 2 QL, one of the tractable fragments of OWL 2, the recently proposed revision of theWeb Ontology Language.We propose some fundamental principles that KB evolution should respect. We review known model and formula-based approaches for evolution of propositional theories. We exhibit limitations of a number of model-based approaches: besides the fact that they are either not expressible in DL-Lite or hard to compute, they intrinsically ignore the structural properties of KBs, which leads to undesired properties of KBs resulting from such an evolution. We also examine proposals on update and revision of DL KBs that adopt the model-based approaches and discuss their drawbacks. We show that known formula-based approaches are also not appropriate for DL-Lite evolution, either due to high complexity of computation, or because the result of such an action of evolution is not expressible in DL-Lite. Building upon the insights gained, we propose two novel formula-based approaches that respect our principles and for which evolution is expressible in DL-Lite. For our approaches we also developed polynomial time algorithms to compute evolution of DL-Lite KBs.".
- 187 hasAuthorList authorList.
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- 187 keyword "semantic web".
- 187 title "Evolution of DL-Lite Knowledge Bases".
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- item-1 hasContent diego-calvanese.
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- item-2 hasContent evgeny-kharlamov.
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- 192 creator bijan-parsia.
- 192 creator samantha-bail.
- 192 creator ulrike-sattler.
- 192 type InProceedings.
- 192 label "JustBench: A Framework for OWL Benchmarking".
- 192 sameAs 192.
- 192 abstract "Analysing the performance of OWL reasoners on expressive OWL ontologies is an ongoing challenge. In this paper, we present a new approach to performance analysis based on justifications for entailments of OWL ontologies. Justifications are minimal subsets of an ontology that are sufficient for an entailment to hold, and are commonly used to debug OWL ontologies. In JustBench, justifications form the key unit of test, which means that individual justifications are tested for correctness and reasoner performance instead of entire ontologies or random subsets. Justifications are generally small and relatively easy to analyse, which makes them very suitable for transparent analytic micro-benchmarks. Furthermore, the JustBench approach also allows us to isolate reasoner errors and inconsistent behaviour. We present the results of initial experiments using JustBench with FaCT++, HermiT, and Pellet. Finally, we show how JustBench can be used by reasoner developers and ontology engineers seeking to understand and improve the performance characteristics of reasoners and ontologies.".
- 192 hasAuthorList authorList.
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- 192 keyword "semantic web".
- 192 title "JustBench: A Framework for OWL Benchmarking".
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- item-1 hasContent samantha-bail.
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- 199 creator carlos-pedrinaci.
- 199 creator guillermo-alvaro.
- 199 creator ivan-martinez.
- 199 creator john-domingue.
- 199 creator maria-maleshkova.
- 199 type InProceedings.
- 199 label "Using Semantics for Automating the Authentication of Web APIs".
- 199 sameAs 199.
- 199 abstract "Recent technology developments in the area of services on the Web are marked by the proliferation of Web applications and APIs. The implementation and evolution of applications based on Web APIs is, however, hampered by the lack of automation that can be achieved with current technologies. Research on semantic Web services is there fore trying to adapt the principles and technologies that were devised for traditional Web services, to deal with this new kind of services. In this paper we show that currently more than 80% of the Web APIs require some form of authentication. Therefore authentication plays a major role for Web API invocation and should not be neglected in the context of mashups and composite data applications. We present a thorough anal ysis carried out over a body of publicly available APIs that determines the most commonly used authentication approaches. In the light of these results, we propose an ontology for the semantic annotation of Web API authentication information and demonstrate how it can be used to cre ate semantic Web API descriptions. We evaluate the applicability of our approach by providing a prototypical implementation, which uses au thentication annotations as the basis for automated service invocation.".