[VE][html5] HTML5 + RDFa 1.1 schema

I'm currently converting an XHTML + RDFa document to HTML5 + RDFa. When 
I run the document through the validator, it gives various errors such as

    RDFa Core attribute datatype is not allowed in HTML5 + RDFa 1.1 Lite
    documents. Consider checking against the HTML5 + RDFa 1.1 schema
    instead.

However, I cannot find out how to validate against the HTML5 + RDFa 1.1 
schema?

Thanks

Dave