Can an employee also be an author? Can a person be neither an employee nor an author?

Define each of the following terms. In addition, provide an example of each term.
Attribute Inheritance
Supertype
Subtype
Generalization
Composite Key
Total Completeness
Partial Completeness
Surrogate Key
Disjoint Subtype
Overlapping Subtype
Part 2: Analyze a Supertype/Subtype ERD (a Subset of a Publisher Database ERD)