> Text()
{
  "content": {
    "text": "message"
  },
  "content_type": "text"
}

> Typing()
{
  "content": {
    "duration": 1000
  },
  "content_type": "typing"
}

> Wait()
{
  "content": {
    "duration": 1000
  },
  "content_type": "wait"
}

> Url()
{
  "content": {
    "url": "https://example.com",
    "title": "title",
    "text": "text"
  },
  "content_type": "url"
}

> Image()
{
  "content": {
    "url": "https://example.com/image.jpg",
  },
  "content_type": "image"
}

> Audio()
{
  "content": {
    "url": "https://example.com/audio.mp3",
  },
  "content_type": "audio"
}

> Video()
{
  "content": {
    "url": "https://example.com/video.mp4",
  },
  "content_type": "video"
}

> File()
{
  "content": {
    "url": "https://example.com/video.mp4",
  },
  "content_type": "file"
}

> Button()
{
  "content": {
    "title": "Button title",
    "payload": "Button payload"
  },
  "content_type": "button"
}

> Payload()
{
  "content": {
    "payload": "Custom payload"
  },
  "content_type": "payload"
}

> Question()
{
  "content": {
    "title": "Question",
    "buttons": [Button]
  },
  "content_type": "question"
}

// CSML
say Question(
    "Where is Brian",
    buttons = [
        Button("In the kitchen"),
        Button("Somewhere else"),
    ]
)
​
// JSON output
{
    "content": {
    "title": "Where is Brian",
    "buttons": [
      {
        "content_type": "button",
        "content": {
          "title": "In the kitchen",
        }
      },
      {
        "content_type": "button",
        "content": {
          "title": "Somewhere else",
        }
      },
    ],
  },
  "content_type": "question"
}