The promise · The boundary · Element
The conditions
What has to be true for the promise to apply.
The part
What it is
Conditions are legitimate — order by a time, provide the information, be within the service area — and they are only fair if they are visible before the customer relies on the promise.
A condition the customer cannot control is not a condition; it is a get-out, and it will be read as one.
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.