@startuml
scale 1.5

' anything after a quote is ignored (a comment).

/' anything between slash quote over several lines
potentially is also ignored '/

/' you can try to uncomment the following line to
see what happens'/

' left to right direction

' list the actors

actor "Librarian" as lib
actor "Head Librarian" as adlib
actor "unauthentified" as other

' list the usecase

rectangle OldFashionLibrary {
usecase "Deal with members" as UC1
usecase "Deal with books" as UC2
usecase "Log out" as UC3
usecase "Log in" as UC4
usecase "Deal with litigation" as UC5

}

' describe the arrows

lib -- UC1
lib -- UC2
lib -- UC3
other -- UC4
adlib -- UC5

lib <|-- adlib

@enduml