Ownership · The handover · Element
The transfer
Who took over.
The part
What it is
Named explicitly and told they now own it, since being assigned without being told is the usual failure.
With a date, so that a question about a decision can be routed to whoever held it at the time.
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.