The cadence · The adherence · Element
The rate
What share of planned publications happened.
The part
What it is
By channel and format, since one format collapsing is a different problem from a general shortfall.
On time as well as at all: something published two weeks late has missed the rhythm even though it exists.
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.