Whether it is read · The unread · Element
The retirement
What happened to the unread.
The part
What it is
Announced, with a date and a route to object. Objections are rare and are usually about one report rather than the process.
Archived rather than deleted, so that a later need can be met without rebuilding.
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.