When querying or reasoning on metadata from the semantic web, the source of this metadata as well as a number of other characteristics (date, trust, etc.) can be of great importance. While the SPARQL query language provides a keyword to match patterns against named graphs, the RDF data model focuses on expressing triples. In many cases it is...
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June 26, 2010 (v1)Conference paperUploaded on: March 25, 2023
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November 16, 2018 (v1)Book
International audience
Uploaded on: December 4, 2022 -
September 7, 2015 (v1)Conference paper
SPARQL query language plays a significant role in developing semantic web and web intelligence. In order to deal with large data query execution over RDF, SPARQL query optimizer is an essential component in the SPARQL query engine for improving query execution performance. This paper proposes an approach for performing query planning and...
Uploaded on: March 25, 2023 -
December 2014 (v1)Report
SPARQL query planning, as an essential task of query optimizer in SPARQL query engine, plays a significant role in improving query execution performance. Based on Corese query engine, this report presents a heuristic-based approach for performing query planning and optimization. First, this report generalizes SPARQL query statement...
Uploaded on: March 25, 2023 -
August 31, 2010 (v1)Conference paper
—In this paper we present the KGRAM abstract machine dedicated to querying knowledge graphs. It is the result of an abstraction process we performed to reach a generic solution to the problem of querying graphs in various models. We identified high level abstract primitives that constitute the expressions of the query language and the...
Uploaded on: February 28, 2023 -
March 9, 2010 (v1)Conference paper
Dans cet article nous présentons la machine abstraite KGRAM et son langage GRAAL pour l'interrogation de graphes de connaissances. KGRAM et GRAAL sont le résultat d'un travail d'abstraction que nous avons mené afin de proposer une solution générique au problème de l'interrogation de graphes de connaissances de différents modèles. Ce faisant,...
Uploaded on: December 3, 2022 -
2016 (v1)Journal article
In this paper we first present the STTL (SPARQL Template TransformationLanguage) language for the transformation of RDF graphs, designed as an exten-sion of SPARQL. Then we present a STTL-based platform for the design of Webbrowsers for the Linked Data. This platform is a SPARQL endpoint augmentedwith an STTL engine and services to run STTL...
Uploaded on: December 3, 2022 -
2015 (v1)Book section
XSLT is a language for transforming XML documents into other XML documents. Despite its 16 years long life, the RDF Semantic Web language still waits its transformation language. Some propositions have been done, relying on and extending XSLT, but none of them became widely used. In this paper, we present a radically new transformation language...
Uploaded on: March 25, 2023 -
May 20, 2015 (v1)Conference paper
The general research question addressed in this paper is: "How to transform RDF into other languages". This is of prime interest to present data selected and extracted from the Web of data in a format suitable for the user (e.g., HTML or CSV). Moreover, RDF can be viewed as a meta-model to represent on the Web of data other languages and...
Uploaded on: March 25, 2023 -
November 2, 2007 (v1)Conference paper
The basic principle of the Semantic Web carried by the RDF data model is that a collection of RDF statements coex-ist all together and are universally true. However some case study imply contextual relevancy and truth. The SPARQL query language is provided with patterns enabling to choose the RDF dataset against which a query is executed. This...
Uploaded on: February 28, 2023 -
January 26, 2010 (v1)Conference paper
Cet article présente la machine abstraite de graphes de connaissance KGRAM qui unifie les notions d'homomorphisme de graphe et de calcul de re-quêtes telles que celles du langage SPARQL sur des données RDF. KGRAM implémente un ensemble extensible d'expressions qui définissent une famille de langages abstraits d'interrogation de graphes, GRAAL....
Uploaded on: February 28, 2023 -
July 1, 2015 (v1)Conference paper
Nous présentons une plate-forme pour la conception de navigateurs permettant une navigation hy-pertexte dans des graphes RDF locaux ou sur le Web et présentant ces données RDF en HTML. Cette plate-forme, nommée ALIGATOR (A LInked data naviGATOR), est basée sur le langage de transformation de graphe RDF STTL (SPARQL Template Transformation...
Uploaded on: March 25, 2023 -
May 12, 2014 (v1)Conference paper
RDF est un langage de représentation de connaissances basé sur des graphes étiquetés, conçu par le W3C pour le Web sémantique et le Web des données. En tant que langage d'échange pivot, il peut être utilisé pour représenter des arbres de syntaxe abstraite (AST) de langages. Par exemple le langage OWL a plusieurs syntaxes dont une syntaxe...
Uploaded on: March 25, 2023 -
July 22, 2007 (v1)Conference paper
The sparql query language is a W3C candidate recommendation for asking and answering queries against RDF data. It offers capabilities for querying by graph patterns and retrieval of solutions is based on graph pattern matching. This paper is dedicated to the implementation of the sparql query language and its pattern matching mechanism which is...
Uploaded on: February 28, 2023 -
May 7, 2002 (v1)Conference paper
With the aim of building a Corporate Semantic Web, the content of the documents must be explicitly represented through metadata in order to enable contents-guided search. The Corese engine is dedicated to the querying of corporate semantic webs whose documents are described into RDF annotations. Corese interprets these RDF metadata in the...
Uploaded on: December 4, 2022 -
December 2015 (v1)Report
The SPARQL query language for RDF is the standard recommended by the W3C to query the Semantic Web. It enables to query and search RDF data by using query graph patterns and filters restricting the solutions produced by graph pattern matching according to the constraints they express. Constraints are either expressions defined according to the...
Uploaded on: March 25, 2023 -
September 9, 2019 (v1)Conference paper
International audience
Uploaded on: December 4, 2022 -
October 23, 2011 (v1)Conference paper
User-centric business intelligence aims at empowering analysts who interact with complex tools, by allowing them to perform accurate data manipulations and analysis without necessarily requiring IT expertise and knowledge of underlying data speci cations. Recommender systems contribute to easing their tasks, but most of them operate inside...
Uploaded on: December 4, 2022 -
November 15, 2016 (v1)Conference paperA SPARQL distributed query processing engine addressing both vertical and horizontal data partitions
An increasing number of linked knowledge bases are openly accessible over the Internet. Distributed Query Processing (DQP) techniques enable querying multiple knowledge bases coherently. However, the precise DQP semantics is often overlooked, and query performance issues arise. In this paper, we propose a DQP engine for distributed RDF graphs,...
Uploaded on: February 28, 2023 -
July 25, 2023 (v1)Publication
Corese is a software platform that implements and extends the standards of the Semantic Web established by the W3C, such as RDF, RDFS, SPARQL1.1 Query & Update, OWL RL, SHACL, and others. This platform offers a wide range of functionalities for creating, manipulating, analyzing, serializing, querying, reasoning, and validating RDF data....
Uploaded on: September 5, 2023 -
April 2, 2014 (v1)Report
RDF can be viewed as a meta-model to represent on the Web other languages and models, and in particular their abstract graph structure. The general research question addressed in this document is "How to transform RDF into other languages" and, in particular, how to generate the concrete syntax of expressions of a given language from their RDF...
Uploaded on: October 11, 2023 -
November 25, 2016 (v1)Report
In addition to the existing standards, Web of Data programmers would take advantage of a dedicated programming language enabling them to define functions on RDF terms, triples and graphs as well as SPARQL query results. In particular, this is the case when defining SPARQL extension functions, and the ability to capitalize complex SPARQL filter...
Uploaded on: February 28, 2023 -
April 2, 2014 (v1)Report
RDF can be viewed as a meta-model to represent on the Web other languages and models, and in particular their abstract graph structure. The general research question addressed in this document is "How to transform RDF into other languages" and, in particular, how to generate the concrete syntax of expressions of a given language from their RDF...
Uploaded on: December 3, 2022 -
July 3, 2017 (v1)Conference paper
Dans cet article, nous abordons la question de recherche générale Comment exprimer des contraintes sur des données RDF et comment vérifier qu'un graphe RDF satisfasse un certain nombre de contraintes ? Nous nous concentrons sur le cas particulier de l'expression des contraintes telles que définies par les profils de OWL 2 et nous vérifions ces...
Uploaded on: February 28, 2023 -
January 31, 2012 (v1)Publication
Semantic Web models have close relationships with rule based languages and systems. In particular, the SPARQL query language restricted to the CONSTRUCT query form can be seen as a rule language: answering such a query is similar to apply a rule in forward chaining to enrich an RDF base, whith the rule antecedent corresponding to the WHERE...
Uploaded on: December 3, 2022