Résumé. Le problème de réconciliation de références consiste à décider si deux descriptions provenant de sources distinctes réfèrent ou non à la même entité du monde réel. Dans cet article, nous étudions ce problème quand le schéma des données est décrit en RDFS étendu par certaines primitives de OWL-DL. Nous décrivons et montrons l’intérêt d’une approche logique basée sur des règles de réconci...

RDF streams are sequences of timestamped RDF statements or graphs, which can be generated by several types of data sources (sensors, social networks, etc.). They may provide data at high volumes and rates, and be consumed by applications that require real-time responses. Hence it is important to publish and interchange them efficiently. In this paper, we exploit a key feature of RDF data stream...

The proliferation of semantic data on the Web requires RDF database systems to constantly improve their scalability and transactional efficiency. At the same time, users are increasingly interested in investigating or visualizing large collections of online data by performing complex analytic queries. This paper introduces a novel database system for RDF data management called dipLODocus[RDF] ,...

In this paper we investigate an extension of XQuery for querying (and inferring) from RDF documents. Following a graph based approach for specifying queries against RDF, XQuery is extended with construction of answers and boolean predicates for RDF entailment relationship inference. We will also study how to implement it in logic programming by using logic rules for executing RDF/XQuery queries.

In this paper we take a view from the bottom to RDF(S) reasoning. We discuss some issues and requirements on reasoning towards effectively building Semantic Web Pipes, aggregating and patching RDF data from various distributed sources. Even if we leave out complex description logics reasoning and restrict ourselves to the RDF world, it turns out that some problems, in particular how to deal wit...

The open source project Edutella is an RDF-based Peer-to-Peer infrastructure for digital resources, focusing on learning materials. Building upon the established meta-data standard RDF(S) appropriate for the description of distributed resources in the World Wide Web WWW, it provides a general RDF-based metadata infrastructure for P2P applications. In this paper, after a short introduction to th...

The Resource Description Framework (RDF) is a triple based representation of directed graphs with labelled edges. With the emergence of RDF graphs special databases, called RDF stores, were developed. In order to query graphs, which are stored in these RDF stores, the query language SPARQL Protocol And Query Language (SPARQL) is used. With the help of this query language it is possible to descr...

The Resource Description Framework (RDF) is intended to be used to capture and express the conceptual structure of information offered in the Web. Interoperability is considered to be an important enabler of future web applications. While XML supports syntactic interoperability, RDF is aimed at semantic interoperability. Interoperability is only given if different users/agents interpret an RDF ...

Sustainability of quality fruit production in Indian jujube is adversely affected by improper irrigation and nutrient management. A field study comprising four levels (drip at 0.8, 0.6 0.4 pan evaporation (E0) surface 1.0 IW/CPE with 50 mm depth) three (100% RDF, 75% RDF+25% RDF as vermicompost 50% RDF+50% vermicompost) was conducted during 2018-19 (11 months) on plant. Results showed that tall...

RDF is a knowledge representation language dedicated to the annotation of resources within the framework of the semantic web. Among the query languages for querying an RDF knowledge base, some, such as SPARQL, are based on the formal semantics of RDF and the concept of semantic consequence, others, inspired by the work in databases, use regular expressions making it possible to search the paths...