The timing

Why this constraint is being addressed now.

The part

What it is

A constraint that has been present for a decade needs an explanation for why this is the year. Usually something has changed that makes it either newly costly or newly solvable.

Where no such change can be named, the honest answer is often that attention became available rather than that the situation shifted.

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.