Semantic Units of the PREMIS Data Dictionary
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in the OWL Ontology ver. 1 is defined as:
Class FormatDesignation 
ObjectProperty hasFormatDesignation
| Containers | Current | Descendants |
|---|---|---|
| 1 - Object 1.5 - objectCharacteristics 1.5.4 - format | 1.5.4.1 formatDesignation | 1.5.4.1.1 formatName 1.5.4.1.2 formatVersion |
| Semantic unit | 1.5.4.1 formatDesignation |
|---|---|
| Definition | An identification of the format of the object. |
| Applicability | Bitstream, File |
| Obligation | Optional |
| Repeatability | Not repeatable |
| Data constraint | Container |
| Usage notes | Either formatDesignation or at least one instance of formatRegistry is required. Both may be included. The most specific format (or format profile) should be recorded. A repository (or format registry) may wish to use multipart format names (e.g., “TIFF_GeoTIFF” or “WAVE_MPEG_BWF”) to achieve this specificity. For any given file or bitstream, the most specific format identified by the repository should be recorded. A restricted or modified version of a format is considered more specific than the format; for example, GeoTIFF is more specific than TIFF; BWF is more specific than WAVE. If a file or bitstream conforms to more than one format of equal specificity, each should be recorded in separate format containers. |