{
  "schema": "guanghu.heartbeat-office-building-internal-lines/v1",
  "line_id": "HB-INTERNAL-LINE-001",
  "building_id": "HB-BUILDING-0001",
  "state": "REGISTERED_LOCAL_NUMBERED_MESSAGE_CONTRACT",
  "participants": ["REGISTERED_OFFICES", "REGISTERED_ROOMS", "PERSONA_PARENT", "ON_DEMAND_AGENTS", "DETERMINISTIC_ORGANS"],
  "message_fields": ["message_id", "from", "to", "subject", "task_or_object_id", "source", "state", "sent_at", "receipt"],
  "delivery_states": ["DRAFT", "QUEUED", "DELIVERED", "ACKNOWLEDGED", "FAILED", "EXPIRED"],
  "rules": [
    "INTERNAL_SEMANTIC_ROUTE_DOES_NOT_REQUIRE_PUBLIC_NETWORK",
    "PHYSICAL_DELIVERY_FAILURE_MUST_NOT_BE_REPORTED_AS_DELIVERED",
    "PRIVATE_OFFICE_CONTENT_DOES_NOT_CROSS_TO_PUBLIC_OR_OTHER_OFFICE_WITHOUT_SCOPE",
    "AGENT_MESSAGES_RETURN_TO_PARENT_PERSONA_AND_DO_NOT_CREATE_INDEPENDENT_AUTHORITY"
  ]
}