@startuml
hide footbox
title XCPD Initiating Gateway
participant INIT as "INIT_GATEWAY\n(Patient Manager)" #99FF99
participant RESP as "RESP_GATEWAY\n(SUT)"
group Cross Gateway Patient Discovery (ITI-55)
INIT -> RESP: PRPA_IN201305UV02
activate RESP
RESP -> INIT: PRPA_IN201306UV02
deactivate RESP
end 
group Cross Gateway Patient Discovery (Deferred mode)
INIT -> RESP: PRPA_IN201305UV02
activate INIT
activate RESP
RESP -> INIT: MCCI_IN000002UV01
... Some delay ...
RESP -> INIT: PRPA_IN201306UV02
INIT -> RESP: MCCI_IN000002UV01
deactivate RESP
deactivate INIT
end
@enduml