Progress · The markers · Element
The trajectory
Where the marker needs to be by when.
The part
What it is
A path rather than a target: what the reading should be at each intermediate point if the vision is on course.
Straight-line paths are usually wrong and are better than none, because they at least allow a divergence to be noticed.
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.