      vocabulary type, the implementation MUST also specify the core
        vocabulary type. For instance, some vocabularies (e.g. VCard) define
        their own types for describing people. An implementation that wishes,
        for example, to use a <code>vcard:Individual</code> as an Actor MUST
        also identify that Actor as a <code><a href="https://www.w3.org/TR/activitystreams-vocabulary/#dfn-person">Person</a></code>
        as illustrated in the previous example.
      </p>

    </section>

  