A2. Metadata are accessible, even when the data are no longer available

Data may be, or become, inaccessible by design, or on request, or by accident. While it was accessible, it may have been used by others. If someone has a reference to data by ID, can they minimally understand the nature and provenance of the data?
Archival Resource Key (ARK) specification (section on policy metadata): https://datatracker.ietf.org/doc/html/draft-kunze-ark-34#section-5.1.1.

Permanence Levels and the Archives for NIH NLM's Permanent Web Documents: https://www.nlm.nih.gov/pubs/techbull/ma05/ma05_archive.html.