[zauguin]

> and {"scheme": "nin:DE", "id": "..."} for a German citizen. (This is to refer to "a legal entity that can own something and that we have an agreement with")

Off-topic, but there isn't really a general ID number for German citizens. There are some numbers for social security or tax purposes, but most people wouldn't give them to other entities and people wouldn't think of them when asked about a ID number in other context. (There is also a number of the ID card, but that only identifies the card and therefore changes whenever you get a new one) So this example would at least not be self-documenting.

[dagss]

Apologies for a bad example. Only strings for existing public registries should be used, so in this case there would be several or no cases for Germany; perhaps none of them prefixed with "nin:".