A rough guide to digital preservation metadata

A rough guide to metadata I published on Twitter once upon day and again in Content-disposition: Archival – Repatriating Dates on Access to Born-digital records online. It provides a cheat-sheet to understanding why we have digital preservation systems that help us to control aspects of a digital object over the longest periods of time, e.g. the metadata that is described here as volatile that might change across file-system boundaries. There is also metadata that we don’t (might not) need to be hands-on with that’s usually embedded in the digital object whereby if we maintain other tooling (ExifTool, FFmpeg for example) is always accessible if we can preserve a bytestream. I think it holds up quite well as a rough guide, but what do you think?