{
  "RequestItems": {
    "tablename1": {
      "Keys": [{
        "key1": {
          "N": "1"
        },
        "key2": {
          "S": "value2"
        }
      }]
    },
    "tablename2": {
      "Keys": [{
        "key3": {
          "N": "3"
        },
        "key4": {
          "S": "value4"
        }
      }, {
        "key5": {
          "N": "5"
        }
      }]
    }
  }
}