Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class Signature 
ObjectProperty hasSignature
DatatypeProperty hasSignatureProperties
| Containers | Current |
|---|---|
| 1 - Object 1.8 - signatureInformation 1.8.1 - signature | 1.8.1.6 signatureProperties |
| Semantic unit | 1.8.1.6 signatureProperties |
|---|---|
| Definition | Additional information about the generation of the signature. |
| Applicability | Bitstream, File |
| Obligation | Optional |
| Repeatability | Repeatable |
| Data constraint | None |
| Usage notes | This may include the date/time of signature generation, the serial number of the cryptographic hardware used, or other information related to the generation of the signature. Repositories will likely want to define a suitably granular structure to signatureProperties. |