如何解析xml文件中存在的json

 <?xml version="1.0" encoding="utf-8"?>
<string xmlns="https://s.com/webservices/">{
  "Status": "0",
  "UserID": "2",
  "SessionTimeOut": "10",
  "TestList": [
    {
      "PlantCode": "01",
      "PlantName": "Master",
      "PlantAddr": "Master",
      "PlantID": "1"
    },
    {
      "PlantCode": "02",
      "PlantName": "Plant1",
      "PlantAddr": "Plant1",
      "PlantID": "2"
    }
  ]
}</string>
 <?xml version="1.0" encoding="utf-8"?>
<string