From FREYA/PID Forum:
The FREYA Project team is pleased to announce the publication of our initial guides on choosing persistent identifiers for different entities and we would like your feedback.
While not intended to be fully comprehensive, they are designed to provide a starting point for anyone thinking about using persistent identifiers in their systems. We created guides for the following entities:
A table summarising all of the guides is also available.
Direct to Guides (via Zenodo)