ZenUML

Use Mermaid zenuml when you want a more code-like sequence description, especially for method-call style interactions.

Basic template

zenuml
    title Simple Call
    Alice->Bob: hello()

Core syntax

• Start with zenuml
• Add title if helpful
• Describe calls with Caller->Callee: method()
• Use nested calls to show deeper interaction

Common example

zenuml
    title Order Submission
    User->UI: submitOrder()
    UI->API: createOrder()
    API->DB: saveOrder()
    API->Queue: publishOrderCreated()
    API-->UI: orderId
    UI-->User: confirmation

Good for

• Call-flow documentation
• API and service interaction sketches
• Developers who prefer a code-like sequence style

Watch for

• If your Mermaid renderer does not support zenuml, use sequenceDiagram instead
• Keep it focused on calls, not every tiny implementation detail