How UML is Refined and Extended: Evolution and Current Status

UML's Open Standardization Model

Major UML Revisions: From 1.x to 2.x

Extension Mechanisms: Stereotypes and Profiles

// Stereotype Example: Three-Tier Architecture

// Boundary Layer (User Interface)
«boundary»
class OrderController {
  + displayOrderForm(): void
  + submitOrder(order: Order): void
  + showConfirmation(orderId: String): void
}

// Control Layer (Business Logic)
«control»
class OrderProcessor {
  - validator: OrderValidator
  - paymentGateway: PaymentGateway
  + processOrder(order: Order): Result
  + validateInventory(items: List): Boolean
}

// Entity Layer (Domain Model)
«entity»
class Order {
  - orderId: String
  - customer: Customer
  - items: List<OrderItem>
  - status: OrderStatus
  + calculateTotal(): Money
}

// Stereotypes communicate architectural role

// without constraining implementation technology

Contemporary Evolution: Beyond OMG Revisions

// PlantUML: Text-Based UML
@startuml
class Order {
  - orderId: String
  - customer: Customer
  + placeOrder(): void
}

class Customer {
  - customerId: String
  - name: String
}

Order "*" --o "1" Customer
@enduml

// Mermaid.js: Markdown-Native UML
```mermaid
classDiagram
    class Order {
        -String orderId
        -Customer customer
        +placeOrder()
    }
    class Customer {
        -String customerId
        -String name
    }
    Order "*" --o "1" Customer
```

// Both inherit UML concepts while adding:
// - Version control integration
// - Automated generation
// - No proprietary tools required

What Modern Practice Replaced

Where UML Extension Succeeded

Current Status in 2026

Future Evolution Directions

Conclusion

UML Overview - Quiz