There is a minor problem with that from the XMPP-s2s POV: it does not (explicitly) cover the case where a server verifies the identity of a peer server (see rfc3920bis 6.2.4 or the s2s section of XEP 0178 for details).

AFAICS, the only difference is that the reference identifier is supplied by the peer instead of being constructed as described in section 4.2.

Therefore, I'd propose adding the following note to the end of section 4.1:
Note: Some application protocols such as XMPP perform the procedure described in this section when verifiying a server identity in a certificate presented by a TLS client. By this, and in contrast to the procedure described in the next subsection, the reference identifier is supplied by the peer (TLS client). Except for this and the inverted client-server role, the verification process remains unchanged.

cheers

philipp
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