Characteristics and Party Types
As with identifiers and names, different Party Characteristics are only appropriate for specific Party Types. “Birth date”, for example, may be appropriate only for the Party Type “person”. The Characteristic “annual sales” is only meaningful for a “company”, and so forth.
Figure 4-10 shows the entity class Party Characteristic Assignment, which is the fact that a particular Party Characteristic is only appropriate for a particular Party Type.
· A Party may only be described by a Party Characteristic if that Party Characteristic is subject to a Party Characteristic Assignment to the Party Type that the Party in question is an example of. (Translation: Party Characteristic Assignments assure ...