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 4-3. 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.
Thus, a Party Relationship from Person “George Gobel” to Organization “The Screen Actors’ Guild” Effective Date “June 18, 1952”, Until Date “February 24,1991”.—would be an example of the Party Relationship Type, “Member”.
The important attributes of this ...