ExperimentalReadonly ExperimentalattributionHuman-readable data attribution the host is obliged to display.
Readonly ExperimentalproviderProvider identifier, e.g. "nominatim", "photon", "pelias", "honua".
Optional Readonly ExperimentalusageUsage/acceptable-use policy for the configured endpoint, when known.
Identifies which provider produced a result and carries that provider's attribution / usage-policy obligations so hosts can surface them (for example in a map attribution control).