Domain Model

  • domain model is a conceptul representation of specific subject area or domain.
  • Elements of a domain model
    • Entities - fundamental concepts or objects in the domain
    • Attributes - properties or characteristics of entities
    • Relationships - how entities are connected with each other
    • Associations - represent the connections between entities in the domain
    • Behaviours - actions or operations that entities can perform with in the domain


domain model of a online book store


  1. Customer: Represents a customer who can browse and purchase books.

    • Attributes: Name, Email, Address
    • Behaviors: Register, Login, PlaceOrder, MakePayment
  2. Book: Represents a book available for sale.

    • Attributes: Title, Author, ISBN, Price
    • Behaviors: GetDetails, AddToCart
  3. Order: Represents a customer's order.

    • Attributes: OrderNumber, Date, TotalAmount
    • Behaviors: AddItem, RemoveItem, CalculateTotalAmount

Relationships and Associations:

  1. Customer-Order Relationship: A customer can place multiple orders.

    • Association: One Customer can have multiple Orders.
    • Cardinality: Customer (1) to Order (0 to many).
  2. Order-Book Relationship: An order can contain multiple books, and a book can be part of multiple orders.

    • Association: One Order can have multiple Books, and one Book can be in multiple Orders.
    • Cardinality: Order (1) to Book (0 to many).