registry
In our digital mental model it's an official digital record book. When people refer to a registry, they usually mean a specific instance, within a multi-tenant registry. E.g. Docker Hub is a multi-tenant registry, where there’s a set of official / public images.
A unique registry can be referenced in one of two ways, by namespace, or by domain.
ACDCs and SAIDS eliminated the need for a centrally controlled namespace registry for credential schemas. schema registry.