g
      serializations using the "<code>application/activity+json</code>" media
      type.
    </li>
    <li>
      When processing Activity Streams 1.0 documents using a JSON-LD
      processing model, implementations can use the special AS 1.0 to AS 2.0
      expansion @context definition provided
      <a href="https://www.w3.org/ns/activitystreams1-context.jsonld">here</a> to produce
      the JSON-LD expanded representation. Refer to the
      <a href="http://www.w3.org/TR/json-ld-api/#expansion-algor