Trade-offs · The exclusion list · Element

The cost

What each exclusion gives up.

The part

What it is

An exclusion with no cost is not a trade-off. Naming what is being forgone is what makes it a real choice rather than a preference dressed as strategy.

It also prepares the argument for when the excluded option returns looking attractive.

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.