Representing Content in RDF (W3C Working Draft 8 sept. 2008)

"This document is a specification for a vocabulary to represent Content in RDF. This vocabulary is intended to provide a flexible framework within different usage scenarios to semantically represent any type of content, be it on the Web or in local storage media. For example, it can be used by Web accessibility evaluation tools to record a representation of the assessed Web content in an Evaluation And Report Language (EARL) 1.0 Schema evaluation report. The document contains introductory information on its usage and some examples."

Les 6 documents de recommandations du W3C pour RDF sont désormais disponibles en français.

Via Planet RDF

Un nouveau groupe de travail a été créé au W3C: RDB2RDF Incubator Group. [Cf. la charte]

The goal of this effort is standardization of approaches (syntax and methodology) for mapping Relational Data Model instance data to RDF (Graph Data Model).

Via Planet RDF

RDFa Syntax Last Call Working Draft

The Semantic Web Deployment Working Group and the XHTML 2 Working Group have published the Last Call Working Draft of RDFa in XHTML: Syntax and Processing. RDFa is a specification for attributes to be used with languages such as HTML and XHTML to express structured data. When publishers can express structured data, and when tools can read it, a new world of user functionality becomes available, letting users transfer structured data between applications and web sites, and allowing browsing applications to improve the user experience. For example, a photo's creator, camera setting information, resolution, location and topic can be published as easily as the original photo itself, enabling structured search and sharing. With RDFa, the rendered, hypertext data of XHTML is reused, so that publishers don't need to repeat significant data in the document content.

Source: W3C via Planet RDF

DCMI signale la parution de nouvelles recommandations: "Expressing Dublin Core metadata using the Resource Description Framework (RDF)".

"This document provides recommendations for expressing DC metadata using RDF, the Resource Description Framework. It does this by describing how the features of the DCMI Abstract Model [ABSTRACT-MODEL] are represented using the RDF model (or abstract syntax), as defined by the RDF Concepts and Abstract Syntax specification [RDF-CONCEPTS]. It does not rely on any specific RDF syntax encoding, though examples using the RDF/XML Syntax Specification [RDF-SYNTAX-GRAMMAR] are provided in Appendix A. This allows Dublin Core metadata to be encoded using this specification in any RDF encoding syntax or other RDF representation system, such as RDF databases."

...

Voir aussi, toujours via DCMI: A major maintenance update of "DCMI Metadata Terms" and the related RDF schemas has been released with improved definitions and usage comments, differentiation between Syntax Encoding Schemes and Vocabulary Encoding Schemes, and the specification of formal domains and ranges for properties.

Planet RDF signale cette vidéo: RDFa Basics (disponible sur YouTube).

RDFa in XHTML: Syntax and Processing (W3C)
A collection of attributes and processing rules for extending XHTML to support RDF

"The modern Web is made up of an enormous number of documents that have been created using HTML. These documents contain significant amounts of structured data, which is largely unavailable to tools and applications. When publishers can express this data more completely, and when tools can read it, a new world of user functionality becomes available, letting users transfer structured data between applications and web sites, and allowing browsing applications to improve the user experience: an event on a web page can be directly imported into a user's desktop calendar; a license on a document can be detected so that users can be informed of their rights automatically; a photo's creator, camera setting information, resolution, location and topic can be published as easily as the original photo itself, enabling structured search and sharing."

Via Planet RDF

Dans ce billet, Planet RDF suggère une série de livres (et autres ressources) essentiels à la compréhension de l'univers du "semantic web". Quelques exemples:

- John F. Sowa, Knowledge Representation: Logical, Philosophical, and Computational Foundations, Brooks Cole Publishing Co., Pacific Grove, CA, 2000.
- Thomas B. Passin, Explorer's Guide to the Semantic Web, Manning Publications Co., 2004.

Voir aussi:

- cette liste très complète de SwBooks (sur ESW Wiki)
- ce mashup de livres sur RDF

Pour mes collègues catalo/meta/bib-sys, à lire sur Figoblog, ce billet: RDF et les bibliothèques: FAQ.

Avant-goût:

"C'est quoi, déjà, RDF ?
Comme son nom l'indique, c'est un cadre de description de ressources. C'est un modèle conceptuel qui permet de décrire des choses. Toutes sortes de choses.

Je suis bibliothécaire. En quoi suis-je concerné par RDF ?
Comme dit, RDF sert à décrire des choses. Or, les bibliothécaires décrivent des choses. Tu es donc très très concerné, cher ami.

Admettons. Peux-tu me dire à quoi RDF pourrait me servir, par exemple ?
Eh bien, par exemple, RDF pourrait te permettre d'améliorer la façon dont tu décris les choses. Non seulement les livres, mais aussi les ressources en ligne, les lieux, les gens, les concepts."

Jaffri, A., Glaser, H. (2007), Knowledge Enhanced Searching on the Web. In Proceedings of 6th International Semantic Web Conference Doctoral Consortium (pre-print), Busan, Corée (déposé sur ECS EPrints)

The move towards a Semantic Web has been in progress for many years and more recently there have been applications that make use of semantic web technology. One of the features that made the Web so easy to use is the ability to search web pages in a matter of seconds through the use of search engines. Now that the use of OWL and RDF as a knowledge representation format is increasing, the possibility appears to improve the quality of searching by using the semantic web to enhance the ‘ordinary’ Web. This paper outlines an ar-chitecture for using distributed knowledge bases to assist and improve search-ing on the web.