We examine the suitability of RDF, RDF Schema (as simple ontology language), and RDF repository Sesame, for providing the backend to a prospective domain-specific web search tool, targeted at the offer of bicycles and their components. Actual data for the RDF repository are to be extracted by analysis modules of a distributed knowledge-based system named Rainbow . Attention is paid to the compa...

RDF (Resource Description Framework) is a web standard defined by the World Wide Web Consortium. In RDF, we can define schemas of interest. For example, we can define a schema about tribes on the Pakistan-Afghanistan borderland, or a schema about violent events. An RDF instance is a set of facts that are compatible with the schema. The principal contribution of this paper is the development of ...

The Resource Description Framework (RDF) is the standard knowledge representation language for the Semantic Web, an evolution of the World Wide Web that aims to provide a well-founded infrastructure for publishing, sharing and querying structured data. This article provides an introduction to RDF and its related vocabulary definition language RDF Schema, and explains its relationship with the O...

The World Wide Web is possible because a set of widely established standards guarantees interoperability at various levels. Until now, the Web has been designed for direct human processing, but the next-generation Web, which Tim Berners-Lee and others call the “Semantic Web,” aims at machine-processible information.1 The Semantic Web will enable intelligent services such as information brokers,...

Warehousing is a promising mean to cross and analyse Statistical Open Data (SOD). But extracting structures, integrating and defining multidimensional schema from several scattered and heterogeneous tables in the SOD are major problems challenging the traditional ETL (Extract-Transform-Load) processes. In this paper, we present a three step ETL processes which rely on RDF graphs to meet all the...

Stefanova, S. 2013. Scalable Preservation, Reconstruction, and Querying of Databases in terms of Semantic Web Representations. Acta Universitatis Upsaliensis. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1052. 59 pp. Uppsala. ISBN 978-91-554-8690-7. This Thesis addresses how Semantic Web representations, in particular RDF, can enable flexib...

The Linking Open Data community project is promoting the creation of interlinked RDF datasets with links between data items identified using dereferenceable URIs. This promising direction for publishing data on the web brings forward a number of issues. A key challenge is to understand the data, the schema, and the interlinks that are actually used both within and across linked datasets. Unders...

The need for fuzzy knowledge bases arises from many application fields, such as trust management. To represent fuzzy data, a syntactic and semantic extension of RDF is proposed. The syntax adds to each triple a truth value. The semantic for Fuzzy RDF and Fuzzy RDF Schema allows to derive truth values for derived statements as well. Fuzzy RDF/RDFS does not aim to become a standard extension to p...

Although RDF is serialized using XML, the many possible syntactic forms and the need for inferencing make it difficult to query RDF using existing XML query languages. Numerous new query languages for RDF with built-in knowledge about the semantics of particular inferencing formalisms like RDF Schema and OWL have been proposed or are currently under development. However most, if not all, are sp...