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@startuml
title Policy Execution

participant REQUESTOR
participant RESPONDEE
participant PDP

autonumber

alt Synchronous Invocation
  REQUESTOR - -> PDP: Execute Policy
  activate PDP
  hnote over REQUESTOR : wait
  PDP - -> REQUESTOR: Policy Execution Result
  deactivate PDP
else Asynchronous Invocation
  REQUESTOR - -> PDP: Execute Policy
  activate PDP
  PDP - -> RESPONDEE: Policy Execution Result
  deactivate PDP
end
@enduml

PlantUML version 1.2019.07beta1(Unknown compile time)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Java Version: 1.7.0_25-b15
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>