       <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-generator">generator</a></code> |
          <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-icon">icon</a></code> |
          <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-image-term">image</a></code> |
          <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-inreplyto">inReplyTo</a></code> |
          <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#d