Edit ACTION-1458: Read http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.3 and make proposal for accept providing default to xf:upload/@mediatype and make proposal for accept-charset for http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.3: http://lists.w3.org/Archives/Public/public-forms/2008May/att-0022/2008-05-14.html#ACTION1