saved the class diagrams as .png so the OjectAid UML plugin isn't needed
to view them:
POS/Class_Diagram.png
POS/src/edu/txstate/db/DB_class_diagram.png
POS/src/edu/txstate/pos/POS_class_diagram.png
POS/src/edu/txstate/pos/model/POS_model_class_diagram.png
POS/src/edu/txstate/pos/storage/POS_storage_class_diagram.png