![Can you add hollow arrow in UML Sequence diagrams to represent the asynchronous message? · Issue #1528 · mermaid-js/mermaid · GitHub Can you add hollow arrow in UML Sequence diagrams to represent the asynchronous message? · Issue #1528 · mermaid-js/mermaid · GitHub](https://user-images.githubusercontent.com/5837277/104243709-49b39980-5461-11eb-81ec-3cd5ceac0531.png)
Can you add hollow arrow in UML Sequence diagrams to represent the asynchronous message? · Issue #1528 · mermaid-js/mermaid · GitHub
![uml - Can a sync message have an async message as a response instead of a reply message? - Stack Overflow uml - Can a sync message have an async message as a response instead of a reply message? - Stack Overflow](https://i.stack.imgur.com/DeK7v.png)
uml - Can a sync message have an async message as a response instead of a reply message? - Stack Overflow
![UML sequence diagrams overview of graphical notation - lifeline, message, execution specification, interaction use, etc. UML sequence diagrams overview of graphical notation - lifeline, message, execution specification, interaction use, etc.](https://www.uml-diagrams.org/sequence-diagrams/sequence-diagram-overview.png)
UML sequence diagrams overview of graphical notation - lifeline, message, execution specification, interaction use, etc.
![uml - Is it a must to have a reply message for synchronous message in sequence diagrams - Stack Overflow uml - Is it a must to have a reply message for synchronous message in sequence diagrams - Stack Overflow](https://i.stack.imgur.com/JY9te.png)