Search (5 results, page 1 of 1)

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Abstract

The focus of research on representing and reasoning with knowledge traditionally has been on single specifications and appropriate inference paradigms to draw conclusions from such data. Accordingly, this is also an essential aspect of ontology research which has received much attention in recent years. But ontologies introduce another new challenge based on the distributed nature of most of their applications, which requires to relate heterogeneous ontological specifications and to integrate information from multiple sources. These problems have of course been recognized, but many current approaches still lack the deep formal backgrounds on which todays reasoning paradigms are already founded. Here we propose category theory as a well-explored and very extensive mathematical foundation for modelling distributed knowledge. A particular prospect is to derive conclusions from the structure of those distributed knowledge bases, as it is for example needed when merging ontologies

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Classification

ST 252 Informatik / Monographien / Software und -entwicklung / Web-Programmierung, allgemein

RVK

ST 252 Informatik / Monographien / Software und -entwicklung / Web-Programmierung, allgemein

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Abstract

Wir stellen eine Erweiterung der klassischen Wiki-Software MediaWiki vor, mit der man Inhalte auf einfache Art und Weise mit semantischen Attributen und Beziehungen anreichern kann. Dies ermöglicht es einem weiten Kreis von Wikipedia-Nutzern, gemeinschaftlich eine semantische Wissensbasis aufzubauen, die im Hinblick auf Größe, Umfang, Dynamik, Offenheit und Reichweite einzigartig wäre. Die semantischen Erweiterungen bergen zahlreiche Vorteile für Wikipedia und andere große Wikis: Sie erlauben die automatische Kontrolle der Konsistenz und Vollständigkeit des Wikis, und sie eröffnen neuartige Möglichkeiten zur Suche nach Informationen und zum Browsen von Inhalten. Ein standardkonformer RDF-Export ermöglicht es darüberhinaus, Wissen aus Wikipedia auch in externen Anwendungen mit geringem Aufwand wiederzuverwenden.

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Abstract

Seven years on from OWL becoming a W3C recommendation, and two years on from the more recent OWL 2 W3C recommendation, OWL has still experienced only patchy uptake on the Web. Although certain OWL features (like owl:sameAs) are very popular, other features of OWL are largely neglected by publishers in the Linked Data world. This may suggest that despite the promise of easy implementations and the proposal of tractable profiles suggested in OWL's second version, there is still no "right" standard fragment for the Linked Data community. In this paper, we (1) analyse uptake of OWL on the Web of Data, (2) gain insights into the OWL fragment that is actually used/usable on the Web, where we arrive at the conclusion that this fragment is likely to be a simplified profile based on OWL RL, (3) propose and discuss such a new fragment, which we call OWL LD (for Linked Data).

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Abstract

This text introduces the standardized knowledge representation languages for modeling ontologies operating at the core of the semantic web. It covers RDF schema, Web Ontology Language (OWL), rules, query languages, the OWL 2 revision, and the forthcoming Rule Interchange Format (RIF). A 2010 CHOICE Outstanding Academic Title ! The nine chapters of the book guide the reader through the major foundational languages for the semantic Web and highlight the formal semantics. ! the book has very interesting supporting material and exercises, is oriented to W3C standards, and provides the necessary foundations for the semantic Web. It will be easy to follow by the computer scientist who already has a basic background on semantic Web issues; it will also be helpful for both self-study and teaching purposes. I recommend this book primarily as a complementary textbook for a graduate or undergraduate course in a computer science or a Web science academic program. --Computing Reviews, February 2010 This book is unique in several respects. It contains an in-depth treatment of all the major foundational languages for the Semantic Web and provides a full treatment of the underlying formal semantics, which is central to the Semantic Web effort. It is also the very first textbook that addresses the forthcoming W3C recommended standards OWL 2 and RIF. Furthermore, the covered topics and underlying concepts are easily accessible for the reader due to a clear separation of syntax and semantics ! I am confident this book will be well received and play an important role in training a larger number of students who will seek to become proficient in this growing discipline.