Capacity · The buffer · Element
The reserve
Finished pieces held ready to publish.
The part
What it is
Two or three evergreen pieces is enough for most calendars and turns a crisis into a substitution.
They have to be genuinely finished and genuinely evergreen, or they will not be usable at the moment they are needed.
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.