While Party is itself an example of Thing, in this Chapter, it has a special part to play. In the management of all the data about Things (including people) there are people responsible for that management. This is true both at the data level (maintaining Thing Characteristics and their use in defining Thing Types and Thing Specifications) and at the level of maintaining data about the Things themselves.
The first case, Figure 9-10, shows that a single Party may be the definer of one or more Thing Characteristics and/or one or more Thing Characteristic Assignments.
Figure 9-10: Thing Meta-roles
The second case is represented in Figure ...