Thanks, Carlos, for the review.
On one item in your list:
> 4. S3.4. Does this text imply there is no zero fee or credit possible? Might be
> useful to explicitly set guidance for the use of 0/null fee/credit.
>
> A <fee:fee> element MUST
> have a non-negative value. A <fee:credit> element MUST have a
> negative value.
The text says the fee can be zero ("non-negative"), but the credit
can't (has to be negative). That makes general sense, doesn't it? Do
you really think there needs to be further explanation of that?
Barry
