Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class Agent 
ObjectProperty hasAgent
| Semantic unit | 3 agent |
|---|---|
| Definition | person, organization, or software program/system associated with Events in the life of an Object, or with Rights attached to an Object. It can also be related to an environment Object that acts as an Agent. |
| Obligation | Mandatory |
| Repeatability | Repeatable |