arcadia 3;
project coastal_ops "Coastal operations" id "00000000-0000-4000-8000-000000000001" {
    oa_actor vessel "Vessel" id "00000000-0000-4000-8000-000000000101" {}
    oa_entity center "Rescue center" id "00000000-0000-4000-8000-000000000102" {}
    oa_activity respond "Respond to distress" id "00000000-0000-4000-8000-000000000103" {}
    oa_activity report "Report distress" id "00000000-0000-4000-8000-000000000104" { parent @respond; }
    oa_activity assess "Assess incident" id "00000000-0000-4000-8000-000000000105" { parent @respond; }
    oa_exchange_item report_data "Distress report" id "00000000-0000-4000-8000-000000000106" {}
    allocation vessel_reporting "Vessel reports" id "00000000-0000-4000-8000-000000000107" { source @vessel; target @report; }
    allocation center_assessment "Center assesses" id "00000000-0000-4000-8000-000000000108" { source @center; target @assess; }
    interaction distress_message "Distress report" id "00000000-0000-4000-8000-000000000109" { source @report; target @assess; items [@report_data]; }
}