Instance
    host Host

    UniqueInstance host

RemoteObject
    instance InstanceId
    ident    LocalURI

    UniqueRemoteObject instance ident

RemoteActivity
    instance InstanceId
    ident    LocalURI
    identNew RemoteObjectId
    content  PersistJSONObject
    received UTCTime

    UniqueRemoteActivity instance ident
    UniqueRemoteActivityNew identNew