oa_exchange_category oa_contact_category "Field contact" id "19bd3a3a-4d0c-56d5-bf50-a6b43fd81771" {
    exchanges [@oa_contact];
    family "Participant";
}

oa_event oa_high_pressure "Pressure alarm detected" id "65d6b8d6-271a-5c84-8b42-abbe310c955e" {
    body {
        Change {
            expression "measured_pressure > operating_limit";
        };
    };
}

oa_exchange_category oa_repair_traffic "Repair work exchanges" id "9349b353-53f2-56f8-b571-a05b09335cdf" {
    exchanges [@oa_repair_request, @oa_repair_report];
}