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HTML microdata [MICRODATA] is an extension to HTML used to embed machine-readable data into HTML documents. Whereas the microdata specification describes a means of markup, the output format is JSON. This specification describes processing rules that may be used to extract RDF [RDF-CONCEPTS] from an HTML document containing microdata.

"Microdata to RDF Distiller This service implements the W3C IG Note on converting microdata to RDF."

The Structured Data Linter is a tool aiding webmasters and web developers to verify the structured data present in their HTML pages. Search engines use structured data to understand webpages more accurately and to present enhanced search results. The Linter understands the microdata, JSON-LD and RDFa formats according to their latest specifications. Note however that it does not guarranty that all consumers (e.g. search engines) will make use of all the structured data available in your page. The linter does not currently support microformats (contributions welcome).

A Semantic content editor based on TinyMCE WYSIWYG editor. RDFaCE is created as a proof of concept for WYSIWYM (What You See Is What You Mean) concept. WYSIWYM aims to enable end-users to easily annotate their content using RDFa and Microdata markups. RDFaCE employs external NLP APIs to suggest namespaces, properties, URIs and to automatically annotate content.

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

provides an overview of our attempts to a more visual Data Web. The term Data Web refers to the evolution of a mainly document-centric Web toward a more data-oriented Web. In its narrow sense, the term describes pragmatic approaches of the Semantic Web, such as RDF and Linked Data. In a broader sense, it also includes less formal data structures, such as microformats, microdata, tagging, and folksonomies.

site defines a collection of schemas (applied in the form of HTML tags) that webmasters can use to markup their historical and genealogical information in a consistent way.

This site provides a collection of schemas, i.e., html tags, that webmasters can use to markup their pages in ways recognized by major search providers. Search engines including Bing, Google and Yahoo! rely on this markup to improve the display of search results, making it easier for people to find the right web pages.

a complementary effort by people from the Linked Data community to express the terms provided by the Schema.org consortium in RDF. We currently provide static RDFS documents of the Schema.org terms in the formats listed below - and yes, we're heavily working on more ;)