RDFa

The goal of the Semantic Web initiative is as broad as that of the Web: to create a universal medium for the exchange of data. It is envisaged to smoothly interconnect personal information management, enterprise application integration, and the global sharing of commercial, scientific and cultural data.

The mission of the RDFa Working Group, part of the Semantic Web Activity is to support the developing use of RDFa for embedding structured data in Web documents in general. The Working Group will publish W3C Recommendations to extend and enhance the currently published RDFa 1.0 documents, including an API. The Working Group will also support the HTML Working Group in its work on incorporating RDFa in HTML5 and XHTML5.

Rich Snippets allows you to enhance your Google search results by marking up web pages with Microformats, RDFa or Microdata.

Initial commit of Dublin Core Vocabulary Management Tool

It checks your web page for RDFa and displays any data found there. It also compares your data against the published recommendations from major consumers/users of RDFa data, to see how well your data matches their requirements.