PlantUML: Extending an use case in usecase diagram

Using the symbol <|--, we can specify one use case extends other.

 

usecaseExtension.txt

@startuml

usecase usecase1
usecase usecase2
usecase usecase3
usecase usecase4

usecase1 <|-- usecase2
usecase1 <|-- usecase3
usecase3 <|-- usecase4

@enduml

Above snippet generates below diagram.

 

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