The exiftool tag names are included in the IPTC Photo Metadata Standard (https://www.iptc.org/std/photometadata/specification/IPTC-PhotoMetadata) as of version 2023.1 rev 0, 2023-10-04.
I only just noticed.
Yes. I they are very good about keeping me in the loop because they use ExifTool internally for testing, etc. In fact, just today I got an email from one of the IPTC metadata leaders asking a technical question.
- Phil