The owners

The named individual on each side.

The part

What it is

Both sides should know who the other’s owner is. Where they do not, the relationship is being run through whoever happens to be in the meeting.

The owner needs enough authority to resolve ordinary issues without escalating, or the role becomes a message-passing function.

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.

Owner
The named individual, per side.
Person shared type
For
Which side they represent.
Entity shared type
Authority
What they can decide alone, which determines whether the role works.
Text shared type