I want to validate a site built with Drupal 7 (with RDFa enabled), using a Genesis's HTML5 sub-theme & with lots of WAI-ARIA added for accessibility.
Looks like with - http://validator.nu - we can do HTML5 & ARIA.
But really not sure how to also evaluate for the RDFa as well.
The W3C doesn't seem to like it either although it can to XHTML & RDFA apparently - http://validator.w3.org
Some guidance on validation would be appreciated. I have heard that someones is maintaining a custom schema for HTML5 & RDFA, but not sure how to use it.