The type person_type was defined in 6.2. The components of this type are suitable for recording personal information about your friends or colleagues. Extend this type to a type employee_type by...

The type person_type was defined in 6.2. The components of this type are suitable

for recording personal information about your friends or colleagues. Extend this

type to a type employee_type by adding components suitable for recording information in a business environment. Possibilities are phone extension, mail stop, and

employee identification number. Do not add a component for salary.