> 20) Line 465 "Which type of voucher": Does the MIME Content-Type
> indicate a voucher, or what specific type of voucher? (Please rephrase
> as this is currently ambgiuous.) If it is the former (and per section
> 10.3 I think it is), why (and not the latter)? What is a voucher type;
> where are the different voucher types defined in this document; how
> would new voucher types be introduced?