Ownership · The owner · Element
The person
Who is accountable.
The part
What it is
One person. Where several claim ownership of the same data set, that is usually the reason it is inconsistent.
In the business function that uses the data, rather than in the one that stores it.
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.