How to validat my website using the Schema tags and XHTML + RDFa?

Hello,I use in my web site 
http://www.location-voiture-4x4-agadir-aeroport.com/
<http://www.location-voiture-4x4-agadir-aeroport.com/>   the *Doctype: XHTML
+ RDFa.*and the :  *
<http://validator.w3.org/check?uri=http%3A%2F%2Fwww.location-voiture-4x4-agadir-aeroport.com&charset=%28detect+automatically%29&doctype=Inline&ss=1&outline=1&group=0&No200=1&verbose=1&user-agent=W3C_Validator%2F1.3>
Markup Validation Service*  found Errors with the tags of Schema.orgis there
any solution without changing the Doctype: XHTML + RDFa?Thanks



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