Notes from past discussions:
2020-12-08 Metadata meeting notes
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2nd tier: Dublin Core, EAD3, EAC-CPF, OAI-PMH, Schema.org (PUI only, so cannot import, but it is published in the PUI) <--- I expect to review this list in particular by the time we publish. Please feel free to suggest different tiers for these as part of our discussion.
3rd tier: Wikidata, Records in Context (RiC), EAD4