@startuml
skinparam linetype ortho

node "Notifications" as notifs {
    class "Notification" as notif

    class "ConcreteNotification_A" as smsNotif
    class "ConcreteNotification_B" as callNotif

    notif <|-u-- smsNotif
    notif <|-u-- callNotif
}

node "Provider" as provider {
    class "NotificationProvider" as notProvider
    class "NotificationsChangedParams" as params
    notProvider -u..>params
}


notProvider "0..1"..> smsNotif
notProvider "0..1"..> callNotif
notProvider *-- notif

params *-->notif

@enduml