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RDF - Semantic Web Standards

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”). 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. 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

http://www.w3.org/RDF/

Related:  teaching: RDF

What is an RDF Vocabulary? A Resource Description Foundation (RDF) vocabulary is a defined set of predicates that can be used in an application. You can define a vocabulary for your application by creating an ontology file, which is an RDF document that contains all possible predicates for an application. An ontology not only defines the predicates themselves, but defines the data type of each predicate and the relationship, if any, of one predicate to another. A vocabulary is similar to a schema in that it defines a set of elements that can be used in an application. However, a vocabulary also helps you to define the domain and range of a predicate. Web's second phase puts users in control Many believe the web has entered a second phase, where new services and software - collectively known as web 2.0 - are transforming the web from a predominantly "read only" medium to one where anyone can publish and share content and easily collaborate with others. The "new" web is already having an impact in class, as teachers start exploring the potential of blogs, media-sharing services, and other social software, which, although not designed specifically for e-learning, can be used to empower students and create exciting new learning opportunities. These same tools allow teachers to share and discuss innovations more easily and, in turn, spread good practice. A travel weblog "Snails are not that bad, they taste like garlic mushrooms when you get them out of the shell," writes Scott on Musselburgh grammar school's Paris-Normandy 2006 web log. Discussing/annotating images

SPARQL Query Language 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. RDFS and Inferencing Resource Description Framework Schema (RDFS) extends RDF with simple organisational constructions. These help define concepts more explicitly and also allow for inferences to be generated with a reasoning engine. Classes and Subclasses An rdfs:Class is a set of elements — it is an organisational construct rather than a tangible object.

SweoIG/TaskForces/CommunityProjects/LinkingOpenData - ESW Wiki News 2014-12-03: The 8th edition of the Linked Data on the Web workshop will take place at WWW2015 in Florence, Italy. The paper submission deadline for the workshop is 15 March, 2015. 2014-09-10: An updated version of the LOD Cloud diagram has been published. The new version contains 570 linked datasets which are connected by 2909 linksets. New statistics about the adoption of the Linked Data best practices are found in an updated version of the State of the LOD Cloud document. 2014-04-26: The 7th edition of the Linked Data on the Web workshop took place at WWW2014 in Seoul, Korea. The workshop was attended by around 80 people.

Semantic Web I have an idea that I think is very important but I haven’t yet polished to the point where I’m comfortable sharing it. I’m going to share it anyway, unpolished, because I think it’s that useful. So here I am, handing you a dull, gray stone, and I’m saying there’s a diamond inside. Maybe even a dilithium crystal.

Turtle Terse RDF Triple Language W3C Working Draft 10 July 2012 This version: RDF and JSON: A Clash of Model and Syntax – Lost Boy I had been meaning to write this post for some time. After reading Jeni Tennison’s post from earlier this week I had decided that I didn’t need too, but Jeni and Thomas Roessler suggested I publish my thoughts. So here they are. I’ve got more things to say about where efforts should be expended in meeting the challenges that face us over the next period of growth of the semantic web, but I’ll keep those for future posts. Everyone agrees that a JSON serialization of RDF is a Good Thing. And I think nearly everyone would agree that a standard JSON serialization of RDF would be even better.

Profile for latest GRDDL transformation for RDFa This page is a profile for GRDDL source documents using the latest GRDDL RDFa transform. Currently the use of this profile licenses RDF data extracted by 2008/09/03/RDFa2RDFXML.xsl from an RDFa source. If you want to declare that a document contains RDFa and always uses the latest profile, add this profile to the head of your XHTML: <head profile=" If you want to use a specific version of the transformation, use the specific profile of that version, e.g.: <head profile=" or reference the transformation directly, e.g.: <head profile=" (...) Welcome to the OpenUp Data Enrichment Service OpenUp Client The OpenUp Client allows you to access DES functionality from any web page you are browsing. Simply drag the bookmarklet link below onto your toolbar and click on it when you want to know more! It's still experimental so there may be the odd glitch! Cross-Origin Resource Sharing (CORS) The client makes use of CORS, allowing data to be posted to the DES.

Notation3 (N3) A readable RDF syntax Up to Design Issues An RDF language for the Semantic Web This article gives an operational semantics for Notation3 (N3) and some RDF properties for expressing logic. These properties, together with N3's extensions of RDF to include variables and nested graphs, allow N3 to be used to express rules in a web environment. This is an informal semantics in that should be understandable by a human being but is not a machine readable formal semantics.

RDF/RDFa RDF/RDFa is major new functionality in Drupal 7 which describes Drupal entities (nodes, user, comments, terms) and their relationship in a format machines can understand. Mappings are defined between local Drupal entities and widely used vocabularies like Dublin Core, FOAF, SIOC, SKOS, etc. These mappings are stored in arrays and can be defined via programming in the modules. The Music Ontology – Specification The Music Ontology Specification provides main concepts and properties fo describing music (i.e. artists, albums and tracks) on the Semantic Web. Latest Version Created

C Opens Data on the Web with SPARQL Powerful Technology for Querying Distributed and Diverse Data Contact Americas, Australia -- Ian Jacobs, <ij@w3.org>, +1.718.260.9447 or +1.617.253.2613 Contact Europe, Africa and the Middle East -- Marie-Claire Forgue, <mcf@w3.org>, +33.492.38.75.94

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