background preloader

W3C Stuff

Facebook Twitter

Resource Description Framework (RDF) / W3C Semantic Web Activity. Overview RDF is a standard model for data interchange on the Web.

Resource Description Framework (RDF) / W3C Semantic Web Activity

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. W3C Semantic Web Activity. The Semantic Web is a web of data.

W3C Semantic Web Activity

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? Can I see bank statement lines in a calendar? 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 RDF Working Group The mission of the RDF Working Group, is to update the 2004 version of the Resource Description Framework (RDF) Recommendation. Linked Data Platform Working Group. POWDER: Use Cases and Requirements.

Abstract This document sets out the use cases and requirements that have motivated the development of the Protocol for Web Description Resources (POWDER).

POWDER: Use Cases and Requirements

The use cases address social and commercial needs to provide information about groups of Web resources, such as those available from a Web site, to aid the annotation and/or personalization of content for end users in varying delivery contexts. Status of this document This section describes the status of this document at the time of its publication.

Other documents may supersede this document. This is a W3C Working Group Note of the POWDER Use Cases and Requirements, developed by the POWDER Working Group as part of the Semantic Web Activity. The Working Group believes the document to be stable and therefore to be suitable as the basis for the group's ongoing work. Please send comments about this document to public-powderwg@w3.org (with public archive). Publication as a Working Group Note does not imply endorsement by the W3C Membership. Semantic data extractor. Quick Introduction This tool, geared by an XSLT stylesheet, tries to extract some information from a HTML semantic rich document.

Semantic data extractor

It only uses information available through a good usage of the semantics defined in HTML4 or XHTML 1. This tool DOES NOT take into account the new semantics added with HTML5, and in particular DOES NOT recognize microdatas, microformats or RDFa. On-line service See a demonstration of the service, relying both on the W3C XSLT Servlet and tidy on-line: More Semantics ? If you have suggestion to improve this XSLT, please send patches to public-qa-dev@w3.org.