Keeping it current · The version record · Element
The versions
Each version, kept in full.
The part
What it is
Superseded wordings rather than a summary of what changed, because the wording is the artefact.
How long each held is the field that carries the most information.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.