{
  "@context": "https://www.w3.org/ns/activitystreams",
  "type": "Article",
  "name": "i'm ready to speak",
  "content": "something",
  "attachment": [{
    "type": "Audio",
    "url": "http://a/podcast.mp3",
    "duration": "P0DT123S",
    "size": 45678
  }, {
    "type": "Video",
    "url": "http://a/vidjo.mov",
    "duration": "P0DT123S",
    "size": 45678
  }],
  "stream": [{
    "duration": 123,
    "size": 45678,
    "url": "http://a/vidjo.mov"
  }]
}
