{
  "title": "Siemens Building Automation Data Structure",
  "description": "Hierarchical data model for Siemens Building X smart building automation systems",
  "type": "object",
  "structure": {
    "Building": {
      "description": "A physical building managed by a Siemens building automation system",
      "fields": {
        "id": { "type": "string", "role": "identifier" },
        "name": { "type": "string", "role": "label" },
        "address": { "type": "string", "role": "location" }
      },
      "children": {
        "Equipment": {
          "description": "A mechanical or electrical system within the building",
          "fields": {
            "id": { "type": "string", "role": "identifier" },
            "name": { "type": "string", "role": "label" },
            "type": { "type": "enum", "values": ["AHU", "Chiller", "Boiler", "FCU", "VAV", "Pump", "Lighting"], "role": "classification" },
            "location": { "type": "string", "role": "location" },
            "status": { "type": "enum", "values": ["operational", "fault", "maintenance", "offline"] }
          },
          "children": {
            "DataPoint": {
              "description": "An individual sensor, setpoint, or actuator connected to equipment",
              "fields": {
                "id": { "type": "string", "role": "identifier" },
                "name": { "type": "string", "role": "label" },
                "type": { "type": "enum", "values": ["analog-input", "analog-output", "binary-input", "binary-output"], "role": "classification" },
                "unit": { "type": "string", "role": "unit" },
                "writable": { "type": "boolean", "role": "capability" }
              },
              "children": {
                "TrendRecord": {
                  "description": "A timestamped historical reading for a data point",
                  "fields": {
                    "value": { "type": "number|boolean|string", "role": "measurement" },
                    "timestamp": { "type": "datetime", "role": "identifier" },
                    "quality": { "type": "enum", "values": ["good", "bad", "uncertain"] }
                  }
                }
              }
            }
          }
        },
        "Alarm": {
          "description": "A detected abnormal condition in the building systems",
          "fields": {
            "id": { "type": "string", "role": "identifier" },
            "name": { "type": "string", "role": "label" },
            "severity": { "type": "enum", "values": ["critical", "high", "medium", "low"], "role": "priority" },
            "status": { "type": "enum", "values": ["active", "acknowledged", "resolved"] },
            "triggeredAt": { "type": "datetime", "role": "audit" },
            "acknowledgedAt": { "type": "datetime", "role": "audit" }
          }
        },
        "Schedule": {
          "description": "An automation schedule controlling system operation times",
          "fields": {
            "id": { "type": "string", "role": "identifier" },
            "name": { "type": "string", "role": "label" },
            "type": { "type": "enum", "values": ["weekly", "exception", "calendar"] },
            "effectiveFrom": { "type": "datetime", "role": "temporal" },
            "effectiveTo": { "type": "datetime", "role": "temporal" }
          }
        }
      }
    }
  }
}