Representations
Model
Representations are the children of Data Objects that represent the original and access files. By design, data objects have at least one original representation and optional access representations as children of the original representation, if the Transformations are supported and configured.
Variants
Variant | Description |
|---|---|
Original | Original format, bit-per-bit preserved. The format can be obsolete (Word Perfect 1.0) and very difficult to read (i.e. MJP2K). |
Access | Form which is ready for direct dissemination by having an universally accepted format (e.g. H264 video) in a decent but manageable quality (i.e. 520p MP4/H264 video) versus a 30000x30000 pixel image (unusable for access because it would crash most browsers). |
Preservation | Format which will have long term support (i.e. PDF 1A) |
Physical | Represents an object in the physical world. This object is metadata only. |
The registry of Formats determines whether an original representation can also serve as a preservation copy.
In MediaHaven, a representation can never be both original and access because original and access representations are stored on physically different storage.
Metadata
What variant a representation is, is expressed by 3 metadata fields
Internal.IsOriginalInternal.IsAccessInternal.IsPreservation