Distribution · The route · Element
The recipients
Who receives it.
The part
What it is
Lists grow and are rarely pruned. People who left, people who asked once, and people copied for information.
A recipient list larger than the set of people who could act on it is a list that dilutes attention.
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.