              <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 non-const references, then
                  the corresponding serializer constructors for messages with this
                  body type will require a non-const reference to a message.
                </p>
             