      object
          </li>
          <li>
            A document representing a collection of the activities addressed
            to an actor or object
          </li>

        </ul>

      </p>

    </section>

    <section>

      <h3>Implementations</h3>

      <p>
        Conforming implementations are software that publish, store, analyze,
        consume or otherwise process conforming documents. The two main kinds
        of implementations are publishers and consumers.
      </p>

      <section>