What is HTML5 Microdata?

I search many article on HTML 5 microdata but i ant got a clear view on that.Can somebody provide me a good article开发者_C百科 on that ??

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Mark Pilgrim's Dive Into HTML5 gives this definition:

Microdata annotates the DOM with scoped name/value pairs from custom vocabularies.

Read the whole section for further explanation and examples.

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http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#microdata

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http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=176035 and http://www.data-vocabulary.org/ are good resources.