Sitographie Flux RSS (en) Tutorial 4: Introducing RDFS & OWL Next: Querying Semantic Data Having introduced the advantages of modeling vocabulary and semantics in data models, let's introduce the actual technology used to attribute RDF data models with semantics. RDF data can be encoded with semantic metadata using two syntaxes: RDFS and OWL. After this tutorial, you should be able to: Understand how RDF data models are semantically encoded using RDFS and OWLUnderstand that OWL ontologies are RDF documentsUnderstand OWL classes, subclasses and individualsUnderstand OWL propertiesBuild your own basic ontology, step by stepEstimated time: 5 minutes You should have already understood the following tutorial (and pre-requisites) before you begin: Tutorial 3: Semantic Modeling In the last lesson, we compared some of the more popular traditional forms of modeling data with the semantic model, and then introduced a situation where data sharing was enhanced and made significantly easier by using a semantic web approach. 4.1 A Starting Example 01. 08. 09. 10. 11.
Sitographie Flux RSS (fr) Ivan’s Semantic Web Presentations This is a list of Semantic Web related presentations that I maintain and try to keep more–or–less up–to–date. Warning: These presentations are never “final”, they all evolve in time. They are not “polished” presentations either in the sense that they contain reduntant slides, they are not necessarily in a 100% logical order, etc. I use these as source materials when I do a presentation somewhere (in which case I “freeze” a particular version by usually combining several sources). With this caveat, here are the available presentations: “High level intro to Semantic Web” The targeted audience are more the managers (“C-level” people) on what the basic idea and goal is. “An introduction to the Semantic Web (Through an Example)” The targeted audience are more the managers, whose technical background is not great and do not want to hear or see, for example, any XML code… But want to have an idea of what this beast is all about. “Semantic Web Adoption and Applications” “State of the Semantic Web”
Sitographie W3C Data Activity - Building the Web of Data More and more Web applications provide a means of accessing data. From simple visualizations to sophisticated interactive tools, there is a growing reliance on the availability of data which can be “big” or “small”, of diverse origin, and in different formats; it is usually published without prior coordination with other publishers — let alone with precise modeling or common vocabularies. The Data Activity recognizes and works to overcome this diversity to facilitate potentially Web-scale data integration and processing. It does this by providing standard data exchange formats, models, tools, and guidance. The overall vision of the Data Activity is that people and organizations should be able to share data as far as possible using their existing tools and working practices but in a way that enables others to derive and add value, and to utilize it in ways that suit them. Achieving that requires a focus not just on the interoperability of data but of communities. News Questions?
Linked Data Caution | Bibliographic Wilderness I have been seeing an enormous amount of momentum in the library industry toward “linked data”, often in the form of a fairly ambitious collective project to rebuild much of our infrastructure around data formats built on linked data. I think linked data technology is interesting and can be useful. But I have some concerns about how it appears to me it’s being approached. I worry that “linked data” is being approached as a goal in and of itself, and what it is meant to accomplish (and how it will or could accomplish those things) is being approached somewhat vaguely. I am particularly wary of approaches to linked data that seem to assume from the start that we need to rebuild much or all of our local and collective infrastructure to be “based” on linked data, as an end in itself. I also think some of those advocating for linked data in libraries are promoting an inflated sense of how widespread or successful linked data has been in the wider IT world. What is linked data? 1. So. …. Why?
W3C Semantic Web Activity Homepage The Semantic Web is a web of data. There is lots of data we all use every day, and it is not part of the web. I can see my bank statements on the web, and my photographs, and I can see my appointments in a calendar. But can I see my photos in a calendar to see what I was doing when I took them? Why not? The Semantic Web is about two things. See also the activity news for an account of recent events, publications, etc. The following groups are part of the Semantic Web Activity. Active Groups Semantic Web Coordination Group The Semantic Web Coordination Group is tasked to provide a forum for managing the interrelationships and interdependencies among groups focusing on standards and technologies that relate to this goals of the Semantic Web Activity. RDFa Working Group The mission of the RDFa Working Group, formerly known as the W3C RDF Web Application Working Group, is to support the developing use of RDFa for embedding structured data in Web documents in general. RDF Working Group
Comprendre le web sémantique et ses enjeux | Le blog de Naoned On entend parler de lui depuis longtemps, certains prétendent le connaître, le web sémantique arrive sur (et surtout derrière) nos écrans ! Pour expliquer ce qu’est le web sémantique, commençons par préciser ce qu’est le web : Le web regroupe : Des contenus de tout type : des médias (images, vidéos, sons) ainsi que du texte de tout format.Des adresses pour accéder à ces contenus.Des liens plus ou moins fort entre ces contenus. Par exemple, une page visuelle est fortement liée à l’image qu’elle contient. Pour expliquer la sémantique, imaginez la situation : vous abordez un article qui parle des papiers, mais vous ne savez pas vraiment de quoi il parle. Votre imaginaire se met en marche au fur et à mesure de la lecture. Vous qui êtes intelligents, vous interprétez ce que cela peut signifier. On peut se demander pourquoi essayer de faire comprendre tout ça à des machines ? Pour être honnête, le web sémantique n’apporte pas réellement de sens, comme nous le faisons, nous, humain.