activitystreams-vocabulary/#dfn-service">Service</a></code>.
      </p>

      <p>
        This specification intentionally defines Actors in only the most
        generalized way, stopping short of defining semantically specific
        properties for each. All Actor objects are specializations of
        <code><a>Object</a></code> and inherit all of the core properties
        common to all Objects. External vocabularies can be used to express
        additional detail not covered by the Activity Vocabula