Hi Joe

This is a good idea. Some minor review comments below.

> 1.  Introduction

>    A resolver with an NTA in effect might send a response that
>    ordinarily would have been suppressed because of validation failures.
>    This document defines a new EDE that can be sent with a response to

Minor editorial nit: I suggest s/with/within/ or s/with/in/

>    indicate that the response was subject to an active NTA.

> 3.  Operational Considerations

>    A resolver with multiple NTAs in place simultaneously MAY include
>    multiple instances of this EDE in a single response, each
>    representing a different NTA.

Is this so that the different EDE option instances may have different
EXTRA-TEXT values?

>    The operator MAY use the EXTRA-TEXT field to add context about the
>    NTA, such as the name at which it was configured, the reason it was
>    put in place, a reference where more information can be found, or its
>    expected duration.  As noted in Section 2 of [RFC8914], EXTRA-TEXT is
>    intended for human consumption; operators SHOULD keep it readable and
>    SHOULD NOT include private or sensitive information.  Structured data
>    MAY be included in the EXTRA-TEXT field, as described in
>    [I-D.ietf-dnsop-structured-dns-error].

I-D.ietf-dnsop-structured-dns-errors are only mean to be generated in
EDE options with specific INFO-CODEs {Filtered, Censored, Blocked}, and
they are further extended by the sub-codes in that draft (i.e., they
depend on the INFO-CODEs being in {Filtered, Censored, Blocked}.

Would it not be better or even more correct to seperate the
I-D.ietf-dnsop-structured-dns-error into a different EDE option, i.e.,
separate from the NTA EDE option?

Overall, nice and succinct.

                Mukund

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