Advanced Techniques Shown:

1. Flowchart (E-commerce Order Processing)

• Multiple decision branches with complex logic
• Parallel processing paths
• Custom styling with classes and colors
• Subgraph organization
• Error handling flows

2. Sequence Diagram (Microservices Authentication)

• Multiple services interaction
• Parallel execution blocks (par/and)
• Alternative flows (alt/else)
• Colored background sections (rect)
• Async operation handling

3. Class Diagram (Order Management System)

• Abstract classes and inheritance
• Multiple relationship types (composition, aggregation)
• Enumerations with values
• Method visibility modifiers
• Complex many-to-many relationships

4. ERD (Social Media Platform)

• Self-referencing relationships
• Junction tables for many-to-many
• Multiple foreign keys
• Various data types
• Complex cardinalities

5. State Diagram (Order State Machine)

• Complex state transitions
• Multiple exit conditions
• Notes and timeouts
• Parallel state handling
• Error recovery paths

6. Git Flow Diagram

• Branch management
• Merge strategies
• Hotfix workflows
• Release management

Pro Tips for Complex Diagrams:

1. Break down complexity - Use subgraphs and sections
2. Consistent naming - Use clear, descriptive identifiers
3. Color coding - Group related elements with colors
4. Documentation - Add notes for complex logic
5. Validation - Test diagrams in multiple renderers

Complex Mermaid Examples

1. Advanced Flowchart - E-commerce Order Processing

2. Complex Sequence Diagram - Microservices Authentication

3. Advanced Class Diagram - Order Management System

4. Complex Entity Relationship Diagram - Social Media Platform

5. Advanced State Diagram - Order State Machine

6. Complex Git Flow Diagram

Key Features Demonstrated:

Flowchart Features:

• Subgraphs and clustering
• Multiple decision points
• Parallel processing paths
• Custom styling and classes
• Complex conditional logic

Sequence Diagram Features:

• Multiple participants
• Parallel execution (par/and)
• Alternative flows (alt/else)
• Notes and annotations
• Colored backgrounds (rect)
• Async operations

Class Diagram Features:

• Abstract classes
• Inheritance relationships
• Composition and aggregation
• Enumerations
• Method visibility modifiers
• Complex relationships

ERD Features:

• Multiple relationship types
• Self-referencing relationships
• Junction tables
• Various cardinalities
• Comprehensive attribute types
• Foreign key relationships

State Diagram Features:

• Complex state transitions
• Parallel states
• Notes and annotations
• Multiple end states
• Conditional transitions
• Timeout handling