The answer is yes. I'm copying the answer I gave on public-rdfa mailing-list so it will be accessible for others in the future here.
will put your browser into strict mode.
Proposed syntax for adding RDFa
Be careful it is still a working draft at the time of this writing: RDFa in HTML
Syntax Style (aka pseudo-xhtml)
You can write mostly with xhtml syntax style without issues. But be aware that your document will not be necessary xhtml mime-type ready. So basically, you can in html5
There is a document, HTML Polyglot, explaining the syntax if you want to serve
documents using both
answered 06 Jul '10, 03:53