I'm getting the following errors from the W3C validator:

Error: Attribute about not allowed on element article at this point.
Warning: RDFa Core attribute about is not allowed in HTML5 + RDFa 1.1 Lite documents. Consider checking against the HTML5 + RDFa 1.1 schema instead.

Comments

Jeff Burnz’s picture

Jeff Burnz commented
Status: Active » Closed (works as designed)

AT does not add RDFa to anything - Drupal core does this.

Jeff Burnz’s picture

Jeff Burnz commented

Ha, actually I am lying, AT in the latest DEV does add rich snippets to breadcrumbs, but this is not the error shown and its optional.

peacog’s picture

peacog commented

Ah, I get it now. Using the HTML5 validator at http://validator.w3.org/nu (rather than the generic validator at http://validator.w3.org) I was able to change the RDFa schema used to RDFa 1,1, and my site passes validation now. Thanks!