Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class Fixity 
InverseFunctionalProperty hasFixity
| Containers | Current | Descendants |
|---|---|---|
| 1 - Object 1.5 - objectCharacteristics | 1.5.2 fixity | 1.5.2.1 messageDigestAlgorithm 1.5.2.2 messageDigest 1.5.2.3 messageDigestOriginator |
| Semantic unit | 1.5.2 fixity |
|---|---|
| Definition | Information used to verify whether an object has been altered in an undocumented or unauthorized way. |
| Applicability | Bitstream, File |
| Obligation | Optional |
| Repeatability | Repeatable |
| Data constraint | Container |
| Creation / Maintenance notes | Automatically calculated and recorded by repository. |