Download - SPARQL Protocol for RDF W3C Recommendation 15 January 2008 New Version Available: SPARQL 1.1 (Document Status Update, 26 March 2013) The SPARQL Working Group has produced a W3C Recommendation for a new version of SPARQL which adds features to this 2008 version. Please see SPARQL 1.1 Overview for an introduction to SPARQL 1.1 and a guide to the SPARQL 1.1 document set. This version: Latest published version: Previous version: Editors: Kendall Grant Clark, <kendall@monkeyfist.com>, Clark & Parsia LLC Lee Feigenbaum, <lee@thefigtrees.net>, Invited Expert Elias Torres, <eliast@us.ibm.com>, IBM Corporation Please refer to the errata for this document, which may include some normative corrections. See also translations. Copyright © 2006-2007 W3C® (MIT, ERCIM, Keio), All Rights Reserved. Abstract Status of This Document This is a W3C Recommendation. 1. 2. <! MalformedQuery
RDF - Semantic Web Standards Overview 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”). This linking structure forms a directed, labeled graph, where the edges represent the named link between two resources, represented by the graph nodes. Recommended Reading The RDF 1.1 specification consists of a suite of W3C Recommendations and Working Group Notes, published in 2014. A number of textbooks have been published on RDF and on Semantic Web in general. Discussions on a possible next version of RDF W3C has recently set up a new RDF Working Group, whose charter is to make a minor revision of RDF. Last modified and/or added All relevant tools
Le web sémantique ou le futur du Web « un blog, des blogs L’expression « Web sémantique » a été utilisée la première fois en 1994 par Tim Berners-Lee, l’inventeur du World Wide Web et directeur du World Wide Web Consortium (« W3C »), qui supervise le développement des technologies communes du Web sémantique. En 1999, Tim Berners-Lee a exprimé la vision du Web sémantique comme suit : « J’ai fait un rêve pour le Web [dans lequel les ordinateurs] deviennent capables d’analyser toutes les données sur le Web — le contenu, liens, et les transactions entre les personnes et les ordinateurs. Un « Web Sémantique », qui devrait rendre cela possible, n’a pas encore émergé, mais quand ce sera fait, les mécanismes plan-plan d’échange, de bureaucratie et de nos vies quotidiennes seront traités par des machines dialoguant avec d’autres machines. Le « Layer cake » de Tim Berners-Lee D’un web orienté « document », nous évoluons donc vers un web qui a du « sens ». (Source : L’E-Réputation à l’heure de la surcharge informationnelle, par Eglantine Schimtt) WordPress:
Langage d'interrogation SPARQL pour RDF Résumé RDF est un format de données de graphe orienté et étiqueté pour représenter des informations dans le Web. Cette spécification définit la syntaxe et la sémantique du langage d'interrogation SPARQL pour RDF. SPARQL peut être utilisé pour exprimer des interrogations à travers diverses sources de données, que les données soient stockées nativement comme RDF ou vues comme du RDF via un logiciel médiateur (middleware). Statut de ce document Cette section décrit le statut de ce document au moment de sa publication. Ceci est une recommandation du W3C. Ce document a été examiné par des membres du W3C, par des développeurs de logiciels, et par d'autres groupes du W3C et des tiers intéressés, et a été approuvé par le Directeur comme recommandation du W3C. Les commentaires à propos de ce document sont à envoyer à public-rdf-dawg-comments@w3.org, une liste de diffusion avec des archives publiques. Annexes 1 Introduction 1.1 Plan du document 1.2 Conventions du document 1.2.1 Espaces de noms Données :
Microformats vs RDFa vs Microdata « Philip Jägenstedt Warning: The microdata syntax has changed (e.g. item="foo" is now itemscope itemtype="foo") since this blog post was written. Don’t copy the examples. I spent last weekend with my good friend Emil sketching a REST-style interface for his graph database Neo4j. One of the output formats we wanted was plain HTML for easy debugging via the browser. The three candidates were microformats, microdata and RDFa. <p> I'm Philip Jägenstedt at <a href=" The simple task at hand is to make my name and homepage machine-readable using each of these formats. Microformats <p class="vcard"> I'm <span class="fn">Philip Jägenstedt</span> at <a class="url" href=" Microformats are “a set of simple, open data formats”, i.e. predefined vocabularies under centralized control. The only thing that distinguishes microformats from random CSS classes is the tree structure. Microformats. RDFa @prefix foaf: < . Back to RDFa.
Download - Facebook Unveils Custom Servers, Facility Design A look at the blue-lit servers inside the cold aisle of the new Facebook data center in Prineville, Oregon. Facebook today unveiled details of its new technology infrastructure, which features custom-built servers, racks and UPS units that will fill its new data center in Prineville, Oregon. The project is Facebook’s first company-built facility, and is optimized from the two-story structure right down to the servers to reflect the company’s vision for energy efficient data center operations. “Being able to design more efficient servers, both in terms of cost and power usage, is a big part of enabling us to build the features we add,” said Mark Zuckerberg, the CEO of Facebook, in a briefing in Palo Alto, California. Facebook’s servers are powered by chips from both Intel and AMD, with custom-designed motherboards and chassis built by Quanta Computer of Taiwan. “That’s the watt you never see and never use,” said Heiliger. Here’s an overview of how Facebook is achieving those efficiencies:
Mark Watson, Ruby and Java Consultant and Author From Enterprise Search to Unified Information Access Semantic web tutorial: RDF, RDFS and SPARQL using CORESE These pages are deprecated ; please go to the pages of our new team Edelweiss updated 17/04/2007 For remarks or questions on this tutorial contact Fabien Gandon This semantic web tutorial gives a quick tour of RDF, RDFS, SPARQL and Rules. TOC: RDFS intro, RDF/XML intro, SPARQL intro, Rules intro, OWL intro. This tutorial uses four files: a small ontology in RDFS: human_2007_04_17.rdfs a small set of annotations in RDF: human_2007_04_17.rdf a small set of rules : human_2007_04_17.rul a standalone version (2.3.0 or above) of the search engine Corese distributed as one executable ".jar" file. A previous version of this tutorial (Corese V2.2.2) is available. Rapid reminder of the basics RDF is a triple model where every assertion is decomposed in three parts: (subject, predicate, object) for instance (tutorial.php, author, "Fabien"). The serialization of RDF in its XML syntax is not unique i.e. the same RDF graph may be represented in different XML forms. example 1: example 2: example 3: or Examples:
★ Le Web Sémantique ou l'importance des données liées , dans con Ce billet n'est pas un transcript de ma conférence sur l'identité numérique et le Web Sémantique à Paris Web mais un document permettant de résumer ce qui a été dit (pour les absents), de lier les ressources citées (pour les fainéants) et de proposer des pistes pour aller plus loin (pour les curieux). Web Sémantique ? Le premier problème du Web Sémantique est probablement son nom. The Semantic Web is a web of data. Mais je ne suis pas vraiment d'accord avec ce nom qui est réducteur et je lui préfère de loin celui de Données Liées qui permet de visualiser d'un seul coup les deux fondements du Web : la donnée et le lien. l'ajout de sens afin d'augmenter la pertinence des contenus ;la constitution d'une base de données à l'échelle du web. Le Web n’est pas seulement une connexion entre machines, c’est une connexion entre individus. Problématiques J'ai choisi d'illustrer mon propos à travers deux problématiques récurrentes dans le web actuel : la gestion de l'identité ;le contrôle des données.
Download - How does easyDNS Compare Against other DNS Providers The way we see it, it's . So we spend it on things that will give you more bang for buck. and will always win our cost/benefit analysis over superbowl ads, junkets or ego-gratifying pep-rallies. Customer Profile #1: You already know all about DNS and you know who we are. If that's the case then it's pointless for us to show up at a conference with an off-duty stripper dolled up in an easy DNS bikini trying to explain how anycast DNS works. Customer Profile #2: All you know is that you need a domain name and somebody you trust told you "just go to easyDNS" Yeah, we get a lot of that around here. In either case you probably clicked on the "About" link in the menu to try and glean exactly just what kind of company we are. We've been in business since 1998. We have no outside investors, no VC funding and no exit plan. If you call us during business hours, you will likely have a real live human pick up the phone after a ring or two. It varies wildly.
AllegroGraph RDFStore Web 3.0's Database Geospatial and Temporal Reasoning AllegroGraph stores geospatial and temporal data types as native data structures. Combined with its indexing and range query mechanisms, AllegroGraph lets you perform geospatial and temporal reasoning efficiently. Social Networking Analysis AllegroGraph includes an SNA library that treats a triple-store as a graph of relations, with functions for measuring importance and centrality as well as several families of search functions. Example algorithms are nodal-degree, nodal-neighbors, ego-group, graph-density, actor-degree-centrality, group-degree-centrality, actor-closeness-centrality, group-closeness-centrality, actor betweenness-centrality, group-betweenness-centrality, page-rank-centrality, and cliques.
NLGbAse: semantic resource and tagin tools for the semantic web