{
  "title": "Southwest Gas Account Structure",
  "description": "Hierarchical structure of a Southwest Gas natural gas distribution customer account and related data entities.",
  "type": "object",
  "structure": {
    "account": {
      "description": "Root Southwest Gas customer account entity",
      "fields": {
        "accountNumber": "string — unique account identifier",
        "accountName": "string — customer or business name",
        "serviceType": "string — Residential | Commercial | Industrial",
        "rateSchedule": "string — tariff schedule code",
        "accountStatus": "string — Active | Inactive | Final | Disconnected",
        "currentBalance": "number — outstanding balance (USD)",
        "dueDate": "date",
        "paperlessBilling": "boolean",
        "autopay": "boolean",
        "budgetBillingAmount": "number — monthly fixed payment (USD)"
      },
      "children": {
        "serviceAddress": {
          "description": "Natural gas service delivery address",
          "fields": {
            "street": "string",
            "city": "string",
            "state": "string — AZ | NV | CA",
            "zipCode": "string"
          }
        },
        "meter": {
          "description": "Natural gas meter at service address",
          "fields": {
            "meterNumber": "string",
            "lastReadDate": "date",
            "lastReadCcf": "number — CCF reading",
            "readType": "string — Actual | Estimated"
          }
        },
        "usageHistory": {
          "description": "Monthly natural gas usage and billing records",
          "type": "array",
          "items": {
            "readDate": "date",
            "usageTherms": "number",
            "usageCcf": "number",
            "billingPeriodStart": "date",
            "billingPeriodEnd": "date",
            "gasCharge": "number — USD",
            "distributionCharge": "number — USD",
            "totalCharge": "number — USD",
            "heatingDegreeDays": "integer"
          }
        },
        "agencyPledges": {
          "description": "Utility assistance pledges from social service agencies",
          "type": "array",
          "items": {
            "pledgeDate": "date",
            "agencyName": "string",
            "pledgeAmount": "number — USD",
            "pledgeStatus": "string — Pending | Applied | Expired"
          }
        }
      }
    }
  }
}