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@startuml
participant Rest
participant "ACM Runtime"
participant "ACM Database"
participant Participants

group Create New Composition type for Migration
Rest -> "ACM Runtime" : Composition Definitions
"ACM Runtime" -> "ACM Database" : Saved Definition
Rest -> "ACM Runtime" : Prime Definition
"ACM Runtime" -> Participants:  [ASYNC] Prime Definition
end group

group Migration per Instance
/'Instance migration from source to target composition type. '/
Rest -> "ACM Runtime" : Migrate Instance\n(InstanceId, sourceCompId, targetCompId, instance properties)
note top
Instance migration from source to target
composition type.
end note
alt "instance Id and Composition Ids exist"
  "ACM Runtime" -> "ACM Database" : Definition Validation
  "ACM Runtime" -> "ACM Database" : instance and AC Element will be set\nin a transitional state (MIGRATING),\n new instance properties will be saved
  "ACM Runtime" -> Participants : [ASYNC] Migration message from source to target composition
  "ACM Runtime" -> Rest : Instance migration has been requested
 else
  "ACM Runtime" -> Rest : 400 Bad Reqest
end
end group
@enduml