zation using the Activity
      Streams 1.0 syntax, and "<code>application/activity+json</code>"
      when producing a serialization conforming to the 2.0 syntax.
    </li>
    <li>
      Implementations that process serializations identified using either
      the "<code>application/stream+json</code>" or the more
      generic "<code>application/json</code>" MIME media type MUST follow
      the syntax and processing rules set by [[AS1]].  The 2.0
      syntax and processing rules apply only when handlin