Please someone help me on how to use form elements so they validate in an rdfa document.

I don't even have all my tags in, just trying to validate the html with the proper headings, doctypes.

This is what I'm getting:
http://validator.w3.org/check?uri=http://showmewebsite.com/searchused.php&charset=(detect+automatically)&doctype=Inline&outline=1&group=0&st=1&user-agent=W3C_Validator/1.767

Please help - I can't seem to find anywhere an example of how to make this valid.