Re: [dmarc-ietf] Final, I hope, tweaks to the tree walk

[Scott Kitterman <[e-mail]>]

On Tuesday, June 28, 2022 12:46:18 PM EDT Scott Kitterman wrote:
...
> The operational distinction between a PSD and a non-PSD is that subdomains
> of a PSD are different organizations and subdomains of non-PSDs are part of
> the same organization.  I believe that's the correct distinction.

Looking back, I think this is a distinction worth adding to the draft as I 
think it will help provide clarity for future readers to resolve any 
ambiguities they find in the text correctly.

The PSD definition is probably overlong already:

> 3.2.8.  Public Suffix Domain (PSD)
> 
>    The global Internet Domain Name System (DNS) is documented in
>    numerous RFCs.  It defines a tree of names starting with root, ".",
>    immediately below which are Top-Level Domain names such as ".com" and
>    ".us".  The domain name structure consists of a tree of names, each
>    of which is made of a sequence of words ("labels") separated by
>    period characters.  The root of the tree is simply called ".".  The
>    Internet community at large, through processes and policies external
>    to this work, selects points in this tree at which to register domain
>    names "owned" by independent organizations.  Real-world examples of
>    these points are ".com", ".org", ".us", and ".gov.uk".  Names at
>    which such registrations occur are called "Public Suffix Domains
>    (PSDs)", and a registration consists of a label selected by the
>    registrant to which a desirable PSD is appended.  For example,
>    "ietf.org" is a registered domain name, and ".org" is its PSD.

My thought is to add text based on the above mail to the paragraph:

PSDs are important to DMARC because subdomains of a PSD are different 
organizations and subdomains of non-PSDs are part of the same organization.

Scott K