Fixed points · The freeze periods · Element
The exceptions
How something gets through.
The part
What it is
A named approver and a small number of legitimate grounds: a security fix, a regulatory requirement, a fault.
Recorded, because the volume of exceptions is the real measure of whether the freeze is working.
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.