Drupal 7 will be able to output rdfa by changing the page.tpl.php to include the XHTML+RDFa 1.0 doctype
Just wondering if the rdfa output is going to be hardcoded into Drupal or if you can override it or turn it off.
If you want to build html 5 sites with Drupal you cant use rdfa because its not part of the html5 spec
Why html 5
You can use html 5 now to build sites with the html 5 shiv to make them work in Internet Explorer, with a bit of css as well
It is possible to use the video tag with an automatic flash fallback with jquery and the swfobject that works in IE
You cant really use the video tag in strict xhtml as it isnt valid, although it does work
html 5 with the video tag makes it easy to build video sites for both the desktop and mobile platforms using only 1 h264 iPhone video. No ogg video needed, force Firefox to use Flash flashback instead.
Question is will Drupal 7 by default output rdfa or any other code that would prevent you from building a valid html 5 site
Heres how to make a valid html 5 page if anyone is interested
The trick is the first metatag
Also html5 shiv for IE and IE stylesheet
iPhone stylesheet and viewport settings
html 5