{
  "course_id": "course01",
  "tasks": [
    {
      "task_id": "course01_chapter01_download",
      "action": "DOWNLOAD",
      "payload": {
        "url": "http://example.com/course01/chapter01/001.mp3",
        "md5": "abc123",
        "target_path": "/data/courses/course01/chapter01/resources/001.mp3"
      }
    },
    {
      "task_id": "course01_chapter01_download_002",
      "action": "DOWNLOAD",
      "payload": {
        "url": "http://example.com/course01/chapter01/002.mp3",
        "md5": "def456",
        "target_path": "/data/courses/course01/chapter01/resources/002.mp3"
      }
    },
    {
      "task_id": "course01_chapter01_download_003",
      "action": "DOWNLOAD",
      "payload": {
        "url": "http://example.com/course01/chapter01/003.mp3",
        "md5": "ghi789",
        "target_path": "/data/courses/course01/chapter01/resources/003.mp3"
      }
    }
  ]
}