>
                <p>
                  * If <code class="computeroutput"><span class="identifier">W</span></code> requires
                  that <code class="computeroutput"><span class="identifier">h</span></code> and <code class="computeroutput"><span class="identifier">v</span></code> are const references, then
                  the corresponding serializer constructors for messages with this
                  body type will will accept a const reference to a message, otherwise:
                </p>
  