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In some sites on web I noticed they are using this doctype. What is this doctype and what is the benefit of this Doctype XHTML+RDFa?
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML+RDFa 1.0//EN' 'http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd'>
<html xmlns='http://www.w3.org/1999/xhtml' xmlns:v="http://rdf.data-vocabulary.org/#" xml:lang='en' dir='ltr'>
<head profile="http://purl.org/uF/2008/03/">
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Basically RDFa is 'Rich snippets and structured markup', it'll allow crawlers to understand the content on your page.
Google explains it best: http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=146898
Sounds like Rich Snippets will be the future of SEO in enough sites start to use them.
Google also has built a testing tool for reading Rich Snippets: http://www.google.com/webmasters/tools/richsnippets
Here's a list of sites already using RDFa: http://rdfa.info/wiki/Examples-in-the-wild
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