Uniqueness

Last updated: 2025-11-17

Uniqueness, as a PID concept, may be seen as a promise that the PID will remain a unique identifier. This means that the PID will not be reused to point to another digital object. This should be maintained by the PID Manager.

PID uniqueness ensures that references and citations using PIDs will always refer to the digital object intended.

It should however be noted that not all PIDs refer to single objects. A special type of PID, concept PIDs, may in turn refer to many objects at once, each having their own PID.