Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class Bitstream 
| Containers | Current |
|---|---|
| 1 - Object | o.b Bitstream |
| Semantic unit | o.b Bitstream |
|---|---|
| Definition | Contiguous or non-contiguous data within a file that has meaningful properties for preservation purposes. |
| Obligation | Mandatory |
| Repeatability | Repeatable |
| Controlled vocabulary | http://id.loc.gov/vocabulary/preservation/objectCategory/bit |