@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