Continuity of state · The carried context · Element
The crossings
Which channel transitions carry context.
The part
What it is
Some pairs of channels are integrated and others are not, usually for historical reasons rather than by design.
The highest-volume crossing is the one worth solving first, and it is knowable from the data.
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.