Exercise: software list
Sometimes it takes more than just a glance at the class diagram to spot problems with a design. Consider the following class type that might be used by a software vendor to list software titles that are available.
There is nothing obviously wrong with this design. However, the users of this database might enter data that would cause problems, as shown below.
| Wordy | Macrosoft | Win, Mac | 9.4, 6.7 |
| Visual B-- | Macrosoft | Win | 6.0 |
| Cherokee | Open Source | Linux, Solaris | 10.4.5.2, 10.3.1.7 |
| Inlook | Hinkysoft | Win, Linux, Palm OS | 0.5 |
| Corral Draw | Corral | Mac | 22.1 |
Revise the class diagram to correct any problems that you find in this design. Then draw the relation scheme for your corrected model.
