Fixed points · The immovable · Element
The consequence
What missing it costs.
The part
What it is
A fine, a lost contract, a lost year. The severity varies enormously and treating all fixed dates as equally serious wastes protection on the cheap ones.
Stated in money or in what is lost, so the protection can be proportionate.
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.