UMLCn 
plantuml用例图 include
include 例子：
plantuml
@startuml
!include https://f.umlcn.com/c4.puml
:User: --> (Use)
"Main Admin" as Admin
"Use the application" as (Use)
Admin --> (Admin the application)
@enduml@startuml
!include https://f.umlcn.com/c4.puml
:User: --> (Use)
"Main Admin" as Admin
"Use the application" as (Use)
Admin --> (Admin the application)
@enduml1
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