@raphael Yes, that's correct.
The proposed data portability extension is based on a liberal interpretation of this part of the spec.
https://codeberg.org/fediverse/fep/src/branch/main/fep/ef61/fep-ef61.md
It defines a new URL type where "authority" part is a DID, not a DNS name:
ap://did:example:123456/path/to/object?name=value#key-id