Registry Fee Extension for the Extensible Provisioning Protocol (EPP)
draft-ietf-regext-epp-fees-20

Thank you for addressing my DISCUSS and COMMENT items.

Two editorial matters that seem to have come up in the edits.
** To address the discuss point "Section 6.1.  This section needs a normative reference to W3C Schema as the format of the blob between the BEGIN and END tags.", [W3C.REC-xmlschema-1-20041028] was added as a reference (thank you!) but not cited in the text.  Please cite that reference in Section 6.1 (or earlier)

** Per IDnits:  "== Missing Reference: 'RFC5646' is mentioned on line 449, but not defined"

Firstly, thank you for working with Carlos to address the OpsDir comments -- he raised some good points (and is nicer than me), so I'm going to be a bit more of a stickeler than he was.

"A <fee:fee> element MUST have a non-negative value." -- Yes, zero is a non-negative value (Hi Barry!), but not listing it explicitly seems like it's just asking for someone to do something like:
## Estimate how many transactions like this we can do:
total_balance / fee       
or something similar. Simply mentioning the word should help lazy coders take this corner case into account. 

How would:
 A <fee:fee> element MUST must have a zero or greater value
work for you?

Also, I must admit I found this bit surprising:
"A <fee:credit> element MUST have a negative value."

If I go to Payless and return a pair of shoes, they give me a **credit** of $20, not of -$20. 
I really think that the credit element should either be treated in the same way, or you could do away with the credit elemans and just have negative "fees" (if I open my credit-card bill and see a charge of -$20 I know what it means), or if you don't want to do that,  provide some clear warning text around this section.
If I were implementing this, and not paying sufficient attention I'd calculate "new_balance = old_balance - fees + credits" -- a simple phrase or two should help prevent stupid errors.

Thank you for the work put into this document. I have only one COMMENT and one NITS see below.

Regards,

-éric

== COMMENT ==

-- Section 3.4 --
C.1) Any reason to have a negative value for <fee:credit> ? This seems counter-intuitive to me.

== NITS ==

Introducing <fee:cd> earlier in the text would improve the readability of the document.