ttp://www.w3.org/TR/json-ld/#the-context">processing
          context</a>. The value of the <code>@context</code> property is defined
          by the [[JSON-LD]] specification. Implementations producing Activity
          Streams 2.0 documents SHOULD include a <code>@context</code> property
          with a value that includes a reference to the normative
          <a href="https://www.w3.org/ns/activitystreams">Activity Streams 2.0 JSON-LD
          @context definition</a> using the URL
          "<code>