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

example

domain model of a online book store

Entities:

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).