I'm drafting a METS/PREMIS profile for images/rips of optical media images (ISOs for data sessions; WAV or FLAC files for audio). One of the pieces of metadata I'd like to include is the output of the cd-info tool, which contains information about the sector layout of the disc. Here's an example:
https://gist.github.com/bitsgalore/9a2838481574c040f7c4b7da4ed59926
However I'm unsure how (and where) to store this info in METS. My initial idea was something like this:
- Create a METS techMD element which is associated with the structmap div element that encompasses all files that were extracted from the physical disc (typically one ISO image and/or multiple audio files).
- Inside this techMD element, create a PREMIS OBJECT instance with xsi:type="premis:representation" (since it describes the disc as a whole, and not an individual ISO image or audio file!)
- Then use PREMIS unit 1.5.7 objectCharacteristicsExtension as a container for wrapping the iso-info output.
The problem here is that the PREMIS 3.0 data dictionary says that the objectCharacteristicsExtension unit (and also its parent unit 1.5 objectCharacteristics) is "Not Applicable" for the intellectual Entity and Representation object types!
This makes me wonder how others are handling this. Is this an oversight of PREMIS, or is there some other (possibly
better) way to do this that I've overlooked?
Any suggestions appreciated!
