| Semantic unit | 1.1 objectIdentifier |
|---|
| Definition | A designation used to identify the Object uniquely within the preservation repository system in which it is stored. |
| Obligation | Mandatory |
| Repeatability | Repeatable |
| Rationale | Each Object held in the preservation repository must have a unique identifier to allow other entities to refer to it and to relate it to descriptive, technical, and other metadata unambiguously. |
| Data constraint | Container |
| Creation /
Maintenance notes | An identifier may be created by the repository system at the time of ingest, or it may be created or assigned outside of the repository and submitted with an object as metadata. Similarly, identifiers can be generated automatically or manually. |
