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This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

HTML5 ~ A vocabulary and associated APIs for HTML and XHTML

"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. "

Callimachus (kəlĭm'əkəs) is a framework for data-driven applications based on Linked Data principles. Callimachus allows Web authors to quickly and easily create semantically-enabled Web applications.

With RDFa, you can easily include extra "structure" in your (X)HTML to indicate a calendar event, contact information, a document license, etc… RDFa is about total publisher control: you choose which attributes to use, which to reuse from other sites, and how to evolve, over time, the meaning of these attributes.This site tracks RDFa specifications, implementations, and news of all sorts. If you have an RDFa implementation, add it to the wiki.

This wiki is the central resource of the microformats community. You'll find current versions of published microformat specifications, specification drafts and publishing patterns. The wiki also hosts development resources, such as brainstorming pages for new formats and issue tracking pages for all current and in-development microformats.

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