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Abstract: Recently, a widespread interest has emerged in using ontologies on the Web. Resource Description Framework Schema (RDFS) is a basic tool that enables users to define vocabulary, structure and constraints for expressing meta data about Web resources. However, it includes no provisions for formal semantics, and its expressivity is not sufficient for full-fledged ontological modeling and reasoning. In this paper, we show how RDFS can be extended to include a more expressive knowledge representation language. That, in turn, would enrich it with the required additional expressivity and the semantics of that language. We do this by describing the ontology language Ontology Inference Layer (OIL) as an extension of RDFS. An important advantage to our approach is that it ensures maximal sharing of meta data on the Web: even partial interpretation of an OIL ontology by less semantically aware processors will yield a correct partial interpretation of the meta data. (17 References)
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© 2002, IEE
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© 2002 Institution of Electrical Engineers. All rights reserved.
Dialog® File Number 2 Accession Number 7362920
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Abstract: Annotea is a Web-based shared annotation system based on a general-purpose open resource description framework (RDF) infrastructure, where annotations are modeled as a class of metadata. Annotations are viewed as statements made by an author about a Web document. Annotations are external to the documents and can be stored in one or more annotation servers. One of the goals of this project has been to re-use as much existing W3C technology as possible. We have reached it mostly by combining RDF with XPointer, XLink, and HTTP. We have also implemented an instance of our system using the Amaya editor/browser and a generic RDF database, accessible through an Apache HTTP server. In this implementation, the merging of annotations with documents takes place within the client. The paper presents the overall design of Annotea and describes some of the issues we have faced and how we have solved them. (27 References)
Subjects:
© 2002, IEE
INSPEC
© 2002 Institution of Electrical Engineers. All rights reserved.
Dialog® File Number 2 Accession Number 7362919
Abstract: The semantic Web is a vision of a next-generation network that lets content publishers provide notations designed to express a crude "meaning" of the page, instead of merely dumping arbitrary text onto a page. Autonomous agent software can then use this information to organize and filter data to meet the user's needs. There has been much effort to refactor the Web more along these lines since the success of the current Web. Proponents of this goal often refer to it as the intelligent Web. For those who focus on the problem of how to express the context-or, the semantics-of content in distributed systems like the Web, this goal is called the semantic Web. Even though this next-generation Web has yet to become a reality, much of the current work on the semantic Web centers on a variety of technologies that are already in widespread, practical use. In particular, the Resource Description Framework (RDF)-which lets content creators express structured metadata statements.
Subjects:
© 2002, IEE
INSPEC
© 2002 Institution of Electrical Engineers. All rights reserved.
Dialog® File Number 2 Accession Number 7318526