RDF
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Antidot apporte sa contribution au développement du Web de Données en ouvrant son implémentation des recommandations R2RML et DirectMapping du W3C. Antidot est impliqué depuis de nombreuses années dans la mise en œuvre opérationnelle des recommandations et standards publiés par le W3C comme RDF , OWL , SKOS ou SPARQL . Ne se cantonnant pas à une approche purement académique, et fort de sa position sur le marché des solutions d’accès à l’information , Antidot a été l’un des premiers éditeurs de logiciels à confronter ces nouveaux outils du Web Sémantique aux besoins et contraintes de grands projets industriels .
db2triples : une implémentation de R2RML et DirectMapping en Open Source « Blog Antidot
This document describes R2RML, a language for expressing customized mappings from relational databases to RDF datasets. Such mappings provide the ability to view existing relational data in the RDF data model, expressed in a structure and target vocabulary of the mapping author's choice. R2RML mappings are themselves RDF graphs and written down in Turtle syntax. R2RML enables different types of mapping implementations. Processors could, for example, offer a virtual SPARQL endpoint over the mapped relational data, or generate RDF dumps, or offer a Linked Data interface. 1 Introduction
R2RML: RDB to RDF Mapping Language
1 Introduction Relational databases proliferate both because of their efficiency and their precise definitions, allowing for tools like SQL [SQLFN] to manipulate and examine the contents predictably and efficiently. Resource Description Framework (RDF) [RDF-concepts] is a data format based on a web-scalable architecture for identification and interpretation of terms. This document defines a mapping from relational representation to an RDF representation. Strategies for mapping relational data to RDF abound.
A Direct Mapping of Relational Data to RDF
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Getting started with RDFa: Creating a basic FOAF profile | webBackplane
Web Sémantique:RDF
Note: XML Prague is also a very interesting pre-conference day, a traditional dinner, posters, sponsors announcements, meals, coffee breaks, discussions and walks that I have not covered in article for lack of time. When I was a child, I used to say that I was feeling Dutch when I was in France and French when I was in the Netherlands. That was nice to feel slightly different and I liked to analyze the differences between Dutch people who seemed to be more adult and civilized and French people who seemed to me more spontaneous and fierce. I have found back this old feeling of being torn between two different culture very strongly this week end at XML Prague.
Resource Description Framework ( RDF ) est un modèle de graphe destiné à décrire de façon formelle les ressources Web et leurs métadonnées , de façon à permettre le traitement automatique de telles descriptions. Développé par le W3C , RDF est le langage de base du Web sémantique . L'une des syntaxes (ou sérialisations ) de ce langage est RDF/XML. D'autres sérialisations de RDF sont apparues ensuite, cherchant à rendre la lecture plus compréhensible ; c'est le cas par exemple de Notation3 (ou N3). En annotant des documents non structurés et en servant d'interface pour des applications et des documents structurés (pe. bases de données, GED, etc.) RDF permet une certaine interopérabilité entre des applications échangeant de l'information non formalisée et non structurée sur le Web.
Resource Description Framework - Wikipédia
RDF is a standard model for data interchange on the Web. RDF has features that facilitate data merging even if the underlying schemas differ, and it specifically supports the evolution of schemas over time without requiring all the data consumers to be changed. RDF extends the linking structure of the Web to use URIs to name the relationship between things as well as the two ends of the link (this is usually referred to as a “triple”). Using this simple model, it allows structured and semi-structured data to be mixed, exposed, and shared across different applications. This linking structure forms a directed, labeled graph, where the edges represent the named link between two resources, represented by the graph nodes. This graph view is the easiest possible mental model for RDF and is often used in easy-to-understand visual explanations.
RDF - Semantic Web Standards
The Friend of a Friend (FOAF) project is creating a Web of machine-readable pages describing people, the links between them and the things they create and do; it is a contribution to the linked information system known as the Web . FOAF defines an open, decentralized technology for connecting social Web sites, and the people they describe. [ more... ] FOAF is part of a shift towards a Web where we can choose the sites and tools we like, without being cut off from friends who made different choices. FOAF lets you share and inter-connect information from diverse sources, move it around, and use it in unexpected new ways. [ more... ] You can read about how it all works or create a FOAF file to upload. Less technical readers can learn about projects using FOAF .
The Friend of a Friend (FOAF) project | FOAF project
FOAF Vocabulary Specification
The Agent class is the class of agents; things that do stuff. A well known sub-class is Person , representing people. Other kinds of agents include Organization and Group . The Agent class is useful in a few places in FOAF where Person would have been overly specific.