A[Rectangle]           %% Standard process
B(Rounded)             %% Alternate process
C([Stadium])           %% Terminal/start-end
D{Diamond}             %% Decision
E{{Hexagon}}           %% Preparation
F[/Parallelogram/]     %% Input/Output
G[\Reverse parallel\]  %% Manual operation
H[(Database)]          %% Data store
I((Circle))            %% Connector
J>Asymmetric]          %% Flag/signal
K[[Subroutine]]        %% Predefined process
L(((Double Circle)))   %% Multiple documents
M[/Trapezoid\]         %% Manual input
N[\Inverse trapezoid/] %% Display

A --> B                %% Arrow
A --- B                %% Line (no arrow)
A -.- B                %% Dotted line
A -.-> B               %% Dotted arrow
A ==> B                %% Thick arrow
A ~~~ B                %% Invisible link (spacing)
A --text--> B          %% Arrow with text
A -->|text| B          %% Arrow with text (alternate)
A <--> B               %% Bidirectional
A o--o B               %% Circle endpoints
A x--x B               %% Cross endpoints

click A "https://example.com" "Tooltip text" _blank
click B callback "Tooltip"

A->>B: Solid arrow (synchronous request)
A-->>B: Dotted arrow (asynchronous response)
A-)B: Open arrow (async message, fire-and-forget)
A--)B: Dotted open arrow (async response)
A-xB: Cross arrow (lost message)
A--xB: Dotted cross arrow

A->>+B: Request    %% Activate B
B-->>-A: Response  %% Deactivate B

Note right of A: Single participant note
Note over A,B: Note spanning participants
Note left of B: Left-side note

autonumber    %% Add at the top to auto-number messages

A <|-- B       %% Inheritance (B extends A)
A *-- B        %% Composition (A owns B, lifecycle bound)
A o-- B        %% Aggregation (A has B, independent lifecycle)
A --> B        %% Association (A uses B)
A ..> B        %% Dependency (A depends on B)
A ..|> B       %% Realization (B implements A)
A -- B         %% Link (solid)
A .. B         %% Link (dashed)

A "1" --> "*" B : has
A "1" --> "0..1" B : may have
A "0..*" --> "1..*" B : relates

note right of StateName
    Multi-line note
    explaining the state
end note

A ||--|| B : "exactly one to exactly one"
A ||--o{ B : "one to zero or more"
A ||--|{ B : "one to one or more"
A }o--o{ B : "zero or more to zero or more"
A |o--o| B : "zero or one to zero or one"

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