Figure 5-2: Parties
People are related to each other; people belong to unions and clubs; departments are contained in divisions; companies band together into industrial associations, buying groups, and so forth.
To address this diversity of possible associations among Parties, the entity class Party Relationship is introduced in Figure 5-3. This allows us to represent any relationship between two parties. That is, each Party Relationship is defined to be from one Party and to another Party.
Figure 5-3: Party Relationships
Thus, a Party Relationship from Person “George Gobel” to Organization “The Screen Actors’ Guild” between ...