Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
DatatypeProperty hasMessageDigestOriginator 
FunctionalProperty hasMessageDigest
| Containers | Current |
|---|---|
| 1 - Object 1.5 - objectCharacteristics 1.5.2 - fixity | 1.5.2.3 messageDigestOriginator |
| Semantic unit | 1.5.2.3 messageDigestOriginator |
|---|---|
| Definition | The Agent that created the original message digest that is compared in a fixity check. |
| Applicability | Bitstream, File |
| Obligation | Optional |
| Repeatability | Not repeatable |
| Rationale | A preservation repository may ingest files that have had message digests calculated by the submitter; checking these ensures that the file as received is the same as the file as sent. The repository may also ingest files that do not have message digests, and so must calculate the initial value upon ingest. It can be useful to know what Agent calculated the initial value of the message digest. |
| Data constraint | None |
| Creation / Maintenance notes | If the calculation of the initial message digest is treated by the repository as an Event, this information could be obtained from an Event record. |
| Examples | DRS A0000978 DRS A0000978 |