pp_gui -[#black]> pp_doc_consumer: retrieve documents within others communities
activate pp_doc_consumer
pp_doc_consumer -> cc_ig: [ITI-18] Registry Stored Query for document entries for patient [MPI_A-PID]\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
activate cc_ig

loop over all responding gateways
  cc_ig -> xc_rg: [ITI-55] Cross Patient Discovery Request [EPR-SPID]
  activate xc_rg

  xc_rg -[#black]> xc_pix_x_ref_consumer: query MPI_B-PID from MPI using EPR-SPID
  activate xc_pix_x_ref_consumer
  xc_pix_x_ref_consumer -> xc_mpi_x_ref_manager: ITI-45 PIX V3 Query [EPR-SPID]
  activate xc_mpi_x_ref_manager
  xc_pix_x_ref_consumer <- xc_mpi_x_ref_manager: ITI-45 PIX V3 Response [MPI_B-PID]
  deactivate xc_mpi_x_ref_manager
  xc_rg <[#black]- xc_pix_x_ref_consumer
  deactivate xc_pix_x_ref_consumer
  cc_ig <- xc_rg: [ITI-55] Cross Patient Discovery Response [MPI_B-PID, homeCommunityId]
  deactivate xc_rg

  cc_ig -> xc_rg: [ITI-38] Cross Gateway Query [MPI_B-PID, homeCommunityId]\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate xc_rg

  xc_rg -[#black]> xc_doc_consumer: retrieve document entries
  activate xc_doc_consumer
  xc_doc_consumer -> xc_doc_registry: [ITI-18] Registry Stored Query [MPI_A-PID]\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate xc_doc_registry
  xc_doc_registry -> cc_adp: XADR Authorization Decision Request\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate cc_adp
  xc_doc_registry <- cc_adp: XADR Authorization Decision Response
  deactivate cc_adp
  xc_doc_consumer <- xc_doc_registry: [ITI-18] Registry Stored Query Response
  deactivate xc_doc_registry
  xc_rg <[#black]- xc_doc_consumer
  deactivate xc_doc_consumer
  cc_ig <- xc_rg: [ITI-38] Cross Gateway Response
  deactivate xc_rg
end
  pp_doc_consumer <- cc_ig: [ITI-18] Registry Stored Query Response
deactivate cc_ig

loop over all document entries received
  pp_doc_consumer -> cc_ig: [ITI-43] Retrieve Document Set Request\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate cc_ig
  cc_ig -> xc_rg: [ITI-39] Cross Gateway Retrieve [homeCommunityId]\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate xc_rg

  xc_rg -[#black]> xc_doc_consumer: retrieve document entries
  activate xc_doc_consumer
  xc_doc_consumer -> ss_doc_repository: [ITI-43] Retrieve Document Set\ngrouped with [ITI-40] Provide X-User Assertion [EPR-SPID]
  activate ss_doc_repository
  note right ss_doc_repository: [CH:ADR] Perform Enforcement of\nXDS Retrieve Document Set transactions (3.1.12)
  deactivate xc_doc_registry

  xc_doc_consumer <- ss_doc_repository: [ITI-43] Retrieve Document Set Response
  deactivate ss_doc_repository
  xc_rg <[#black]- xc_doc_consumer
  deactivate xc_doc_consumer

  cc_ig <- xc_rg: [ITI-39] Cross Gateway Retrieve Response
  deactivate xc_rg
  pp_doc_consumer <- cc_ig: [ITI-43] Retrieve Document Set Response
  deactivate cc_ig
end  
pp_gui <[#black]- pp_doc_consumer
deactivate pp_doc_consumer