@startuml

!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Context.puml

Person_Ext(web_user, "Web User", "User with basic needs or few technical skills")
Person_Ext(api_user, "API User", "User with advanced needs and some technical skills")
Person(contributor, "Contributor", "Developer improving or extending MetroSim")

Boundary(metropolis, "Metropolis") {
    System_Ext(metroweb, "MetroWeb", "Web-based user interface and Web API")
    System(metrosim, "MetroSim", "Multi-modal dynamic traffic assignment simulator")
}

Rel(web_user, metroweb, "Writes input, runs simulations, reads output")
Rel(api_user, metroweb, "Makes requests")
Rel(contributor, metrosim, "Installs and modifies")
Rel(metroweb, metrosim, "Runs and reads output")

SHOW_DYNAMIC_LEGEND()

@enduml