Message architecture · The audience variants · Element

The invariants

What must be identical across every audience.

The part

What it is

Facts, commitments and anything that could be checked. Emphasis may vary; substance may not.

Naming the invariants in advance is what makes the variants safe to produce without central review of every piece.

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.