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Web sémantique RDF Data & Metadata

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Le web à venir par Tim Berners-Lee. Raw data. Raw datas (also known as primary data) is a term for data collected from a source.

Raw data

Raw data has not been subjected to processing or any other manipulation, and are also referred to as primary data. Raw data is a relative term (see data). Raw data can be input to a computer program or used in manual procedures such as analyzing statistics from a survey. The term can refer to the binary data on electronic storage devices such as hard disk drives (also referred to as low-level data). In computing, raw data may have the following attributes: possibly containing errors, not validated; in different (colloquial) formats; uncoded or unformatted; and suspect, requiring confirmation or citation.

Semantic Web. The Semantic Web is a collaborative movement led by international standards body the World Wide Web Consortium (W3C).[1] The standard promotes common data formats on the World Wide Web.

Semantic Web

By encouraging the inclusion of semantic content in web pages, the Semantic Web aims at converting the current web, dominated by unstructured and semi-structured documents into a "web of data". The Semantic Web stack builds on the W3C's Resource Description Framework (RDF).[2] According to the W3C, "The Semantic Web provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries".[2] The term was coined by Tim Berners-Lee for a web of data that can be processed by machines.[3] While its critics have questioned its feasibility, proponents argue that applications in industry, biology and human sciences research have already proven the validity of the original concept.

History[edit] Purpose[edit] Limitations of HTML[edit] Linked data. An introductory overview of Linked Open Data in the context of cultural institutions.

Linked data

In computing, linked data (often capitalized as Linked Data) describes a method of publishing structured data so that it can be interlinked and become more useful. It builds upon standard Web technologies such as HTTP, RDF and URIs, but rather than using them to serve web pages for human readers, it extends them to share information in a way that can be read automatically by computers.

This enables data from different sources to be connected and queried.[1] Linked Data. What is Linked Data?

Linked Data

The Semantic Web is a Web of Data — of dates and titles and part numbers and chemical properties and any other data one might conceive of. The collection of Semantic Web technologies (RDF, OWL, SKOS, SPARQL, etc.) provides an environment where application can query that data, draw inferences using vocabularies, etc. W3C Standards. How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog.

This started out as an answer at Semantic Overflow on how RDF database systems differ from other currently available NoSQL solutions.

How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog

I've here expanded the answer somewhat and added some general-audience context. RDF database systems are the only standardized NoSQL solutions available at the moment, being built on a simple, uniform data model and a powerful, declarative query language. These systems offer data portability and toolchain interoperability among the dozens of competing implementations that are available at present, avoiding any need to bet the farm on a particular product or vendor. In case you're not familiar with the term, NoSQL ("Not only SQL") is a loosely-defined umbrella moniker for describing the new generation of non-relational database systems that have sprung up in the last several years.

These systems tend to be inherently distributed, schema-less, and horizontally scalable. RDF database systems form the largest subset of this last NoSQL category. What is RDF and what is it good for? Go! (langage de programmation) Un article de Wikipédia, l'encyclopédie libre.

Go! (langage de programmation)

Pour les articles homonymes, voir GO. Go! Est un langage de programmation concurrent, originellement conçu par Keith Clark et Francis McCabe en 2003[1]. Keyword. Heritrix. Un article de Wikipédia, l'encyclopédie libre.

Heritrix

Heritrix a été développé conjointement par Internet Archive et les Bibliothèques Nationales Nordiques en 2003. Sa première publication officielle a eu lieu en janvier 2004, et il a depuis été continuellement amélioré par les membres d'Internet Archive et par des tiers intéressés. Robot d'indexation. Un article de Wikipédia, l'encyclopédie libre.

Robot d'indexation

Pour les articles homonymes, voir Spider. FR: La nature de la toile ? LinkedData vs Ontology. Metaweb. Introduction à RDFa. Résumé.

Introduction à RDFa

FR: Comment publier des données liées. JSON to RDF. Sometimes, if you stand in the right place and squint, JSON and RDF line up perfectly.

JSON to RDF

Each time I notice this, I badly want a way to make them line up all the time, no matter where you’re standing. And, actually, I think it’s pretty easy. I’ve seen a few proposals for how to work with RDF data in JSON, but the ones I’ve seen put too much burden on JSON folks to accomodate RDF. It seems to me we can let JSON keep doing what it does so well, and meanwhile, we can provide bits of RDF which can be adopted when needed. Instead of pushing RDF on people, allow them to take the parts they find useful. In thinking about it, I’ve come up with six things RDF can do that are not standard parts of JSON. I’m interested to hear what people think of this. Step 0: Start with ordinary JSON In general, JSON and RDF are very similar, although they are usually described using different terminology.

De Web 1.0 à Web 2.0 & Web 3.0. LinkedData vs Ontologies. Screencast: DBpedia & W3C Linking Open Data. DBpedia. DBpedia ( from "DB" for "database" ) is a project aiming to extract structured content from the information created as part of the Wikipedia project. This structured information is then made available on the World Wide Web.[1] DBpedia allows users to query relationships and properties associated with Wikipedia resources, including links to other related datasets.[2] DBpedia has been described by Tim Berners-Lee as one of the more famous parts of the decentralized Linked Data effort.[3] Background[edit] The project was started by people at the Free University of Berlin and the University of Leipzig, in collaboration with OpenLink Software,[4] and the first publicly available dataset was published in 2007.

It is made available under free licences, allowing others to reuse the dataset. Linked Data. RDF Web Applications Working Group. Current and Upcoming Events Teleconferences: The first Thursday of each month at 10am US Eastern time. An agenda is sent to rdfa-wg 24 hours in advance; minutes follow within a day or two. Will be monitoring comments on any specification or test cases W3C Standards and Notes HTML+RDFa 1.1 (REC) This specification defines rules and guidelines for adapting the RDFa Core 1.1 and RDFa Lite 1.1 specifications for use in HTML5 and XHTML5. Inputs. Web sémantique : Google, Yahoo et Bing font enfin route commune. Désormais, les développeurs Web ont un bonne raison d’ajouter les technologies du Web Sémantique dans leurs pages Web.

Google, Yahoo et Microsoft, les trois acteurs qui font la pluie et le beau temps dans la recherche en ligne dans le monde, ont décidé de s’entendre sur des spécifications communes en termes de tags sémantiques à greffer aux pages HTML. Les trois moteurs de recherche ont ainsi décidé de collaborer au sein de schema.org, un projet qui entend livrer une série de vocabulaires et de schémas types sur lesquels les développeurs pourront se reposer pour structurer leurs données dans HTML. FAQ - schema.org.

What is the purpose of schema.org? Why are Google, Bing, Yandex and Yahoo! Collaborating? Aren't you competitors? There are lots of schemas out there. Why create a new one? Is schema.org a standards body like the W3C or IETF ? How does schema.org relate to Facebook Open Graph? Semantic Web roadmap. Up to Design Issues A road map for the future, an architectural plan untested by anything except thought experiments. This was written as part of a requested road map for future Web design, from a level of 20,000ft. It was spun off from an Architectural overview for an area which required more elaboration than that overview could afford.

Linked Data - Design Issues. Up to Design Issues The Semantic Web isn't just about putting data on the web. It is about making links, so that a person or machine can explore the web of data. With linked data, when you have some of it, you can find other, related, data. Semantic Web History: Nodes and Arcs 1989-1999 (the WWW Proposal. Initial version: 1999-11-12, Dan Brickley danbri@w3.org Revised: March 2001 Status: This is a work in progress, and an early release of the document for feedback from the RDF Interest Group. It is intended as an informal discussion document, and is not a formal publication of any working group, or of the W3C itself. See the Semantic Web Activity pages for information about current W3C work in this area. Although the HTML is valid and the RDF/XML parses successfully with SiRPAC, W3C's Java RDF parser, readers are cautioned that the Javascript demonstration referenced here will only work on some platforms.

General comments on this work-in-progress should be sent to the RDF Interest Group; bug reports should be sent to the author. Information Management: Then and Now. The Semantic Web - on the respective Roles of XML an. BibTeX Bookmark OpenURL Abstract. Métadonnée de photos - Valorisation/Récupération. A l'image de Michel Rolland et de, certainement, beaucoup d'autres, je me suis posé des questions sur la survie de Flick'r au moment de l'offre de rachat de Yahoo !

Par Microsoft. Même si ces dernières n'ont pas abouti, mes interrogations ne m'ont pas quitté, d'autant plus que Flick'r ne semble pas une priorité de Yahoo !. Or, je préfèrerais récupérer mes données, avant d'être dans la situation que décrit Karl dans ce billet. Web thinkers. Web sémantique.