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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>
+\ No newline at end of file