The Resource Description Framework (RDF) is a Semantic Web standard that provides a data language, simply called RDF, as well as a lightweight ontology language, called RDF Schema. We investigate embeddings of RDF in logic and show how standard logic programming and description logic technology can be used for reasoning with RDF. We subsequently consider extensions of RDF with datatype support,...

This paper reviews the process that was undertaken in revising the transfer syntax for RDF as defined in the RDF Model and Syntax W3C Recommendation[1] by the RDF Core Working Group[2] and the problems that are now clear especially comparing the revised RDF model and new abstract syntax. The syntax looks out of date in particular with the use of XML QNames giving unconstrained syntax terms in t...

E-Commerce applications require the exchange of data in an interoperable manner. XML enables syntactic interoperability but more sophisticated E-Commerce applications require semantic interoperability as well. RDF is an application of XML intended to exchange semantics between Web applications. RDF schemata can be used to describe the concepts and constraints of a specific application domain at...

Cost Analysis of Joins in RDF Query Processing Using the TripleT Index By Kanwei Li The Semantic Web movement has led to a growing popularity of RDF and its query languages. Clearly, good query performance is important in allowing information to be quickly retrieved from RDF datasets that are everincreasing in size. We use the TripleT indexing scheme for RDF data as a framework to examine the c...

Both Topic Maps and RDF are popular semantic web standards designed for machine processing of web documents. Since these representations were originally created for different purposes, they have differences both in their concepts and in their data models. The Topic Map data model can be seen as an ontology for building indices over web documents, whereas RDF is a language to define arbitrary pr...

Like for coal and biomass, the storage of Refused Derived Fuels (RDF) processed through a mixture of non hazardous waste has self-ignition (SI) risks. Some combustible waste fires have been associated to chemical oxidation (T>70oC), one of the self-heating (SH) mechanisms that occurs before SI. Literature about factors that influence these processes in RDF is scarce. Thus, main objective was to...

(EN) The Resource Description Framework (RDF) is a standard for the semantic web that allows describing web resources by means of metadata, providing " interoperability between applications that exchange machine-understandable information on the web ". Using RDF to describe resources in a distributed environment like the web or a grid needs a framework to enable distributed RDF specifications. ...

The Resource Description Framework (RDF) is an interoperable data representation format suitable for interchange and integration of data, especially in Open Data contexts. However, RDF is also becoming increasingly attractive in scenarios involving sensitive data, where data protection is a major concern. At its core, RDF does not support any form of access control and current proposals for ext...

The growing size of Semantic Web data expressed in the form of Resource Description Framework (RDF) has made it necessary to develop effective ways of storing this data to save space and to query it in a scalable manner. SPARQL – the query language for RDF data – closely follows SQL syntax. As a natural consequence most of the RDF storage and querying engines are based on modern database storag...

Un défi majeur en informatique est la modélisation et le raisonnement sur les données temporelles. Ce travail est devenu encore plus important avec l'émergence du Web sémantique où de grandes quantités données hétérogènes sont manipulées. Ces données comportent souvent des informations temporelles informelles, semi-formelles ou formelles qui doivent être interprétées par les agents logiciels. D...