# A4: Conceptual Data Model

> Brief presentation of the product.
> Brief presentation of the artefact goals.

## 1. Class diagram

> UML class diagram containing the classes, associations, multiplicity and roles.
> For each class, the attributes, associations and constraints are included in the class diagram.

## 2. Additional Business Rules

> Business rules can be included in the UML diagram as UML notes or in a table in this section.