: "http://example.org/album/thumbnail.jpg",
          "mediaType": "image/jpeg"
        }
      }
    }
  ]
}</pre>
  </div>
</figure>
    </section>
  </section>

  <section id="model">
    <h2>Model</h2>

    <p>
      The <a href="https://www.w3.org/TR/activitystreams-vocabulary/">Activity Vocabulary</a>
      normatively defines the core object types and properties for Activity
      Streams 2.0.
    </p>

    <p>
      The object types defined by the vocabulary are segmented into a set of
      eight c