The ProductSpecification subsystem contains those classes that describe the organization of products offered by the bookstore.
The class diagram for this subsystem is shown in Figure B.1.
A Product is an item available for sale by the online store. The online store currently offers books (hardcover and paperback), CDs, tapes, videotapes, and DVDs (all classified as “Recordings”), and computer software.
The UPC code of the product. These are provided by the manufacturer based on a coding scheme established ...