We begin the introduction to RDFa by using a subset of all the possibilities called RDFa Lite 1.1 [rdfa-lite]. The goal, when defining that subset, was to define a set of possibilities that can be applied to most simple to moderate structured data markup tasks, without burdening the authors with additional complexities. Many Web authors will not need to use more than this minimal subset.
An RDF programmer would like to work with an extension of KB that includes also the realized semantics that KB is implicitly carrying. To generate this extension, or view, the RDF programmer can define an instance of [nrl:ViewSpecification] that computes and returns the procedural semantics for KB. The view specification uses a rule language of choice that provides a number of rules, one of which computes the transitive closure of rdfs:subClassOf, as defined in the RDFS semantics, for a set of RDF triples. Executing the chosen rules over the triples in KB result in a semantic view RDFS(KB) consisting of the RDF triples in KB plus the generated entailment triples. Next, the RDF programmer needs to present some of this extended data to an average user in a simplified way. In particular, the user would at some point like to see the class hierarchy present in RDFS(KB). NEPOMUK Representational Language (NRL)
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DOAC: Description of a Career
This article discusses what you need to know to make your Web site part of the Semantic Web. It starts with a discussion of the problems the Semantic Web tries to solve and then moves to the technologies involved, such as Resource Description Framework (RDF), Web Ontology Language (OWL), and SPARQL Protocol and RDF Query Language (SPARQL). You'll see how the Semantic Web is layered on top of the existing Web. It then covers some issues that you want to know about when you plan a new Web site and also gives specific examples of how to use technologies like RDFa and Microformats to enable your existing Web site to become a part of the Semantic Web. Introduction to the Semantic Web The World Wide Web is the largest single information resource humanity has ever produced. Planning a Semantic Web site
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FOAF is an RDF spec for describing people and the relationships between them. I thought FOAF had mostly died and been replaced by hcard/XFN. However, it looks like FOAF is going to make a come back as one of the technologies that people build their OpenSocial APIs on top of. So I decided to add it to CrowdVine. » Implementing FOAF in Rails <CrowdVine Blog>
There was an official announcement, as well as some references, on the fact that the structure of data related work has changed at W3C. A new activity has been created called “Data Activity” , that subsumes what used to be called the Semantic Web Activity. “Subsumes ”is an important term here: W3C does notabandon the Semantic Web work (I emphasize that because I did get such reactions); instead, the existing and possible future work is simply continuing within a new structure. The renaming is simply a sign that W3C has also to pay attention to the fact that there are many different data formats used on the Web, not all of them follow the principles and technologies of the Semantic Web, and those other formats and approaches also have technological and standardization needs that W3C might be in position to help with.
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