如何在Avro模式中包含多条记录？

{
  "type": "array",
  "items": {
    "type": "record",
    "name": "Student",
    "fields": [
      {"name": "name", "type": "string"},
      {"name": "age", "type": "int"},
      {"name": "grade", "type": "string"}
    ]
  }
}

{
  "type": "map",
  "values": {
    "type": "record",
    "name": "City",
    "fields": [
      {"name": "name", "type": "string"},
      {"name": "population", "type": "int"}
    ]
  }
}

{
  "type": "record",
  "name": "Order",
  "fields": [
    {"name": "orderId", "type": "int"},
    {"name": "customer", "type": "string"},
    {"name": "items", "type": {
      "type": "array",
      "items": {
        "type": "record",
        "name": "Item",
        "fields": [
          {"name": "name", "type": "string"},
          {"name": "price", "type": "float"}
        ]
      }
    }}
  ]
}