> if <code class="computeroutput"><span class="identifier">seq</span></code>
                is an <a class="link" href="../../concepts/associative_sequence.html" title="Associative Sequence">Associative
                Sequence</a>.
              </li>
</ul></div>
<p>
            <span class="bold"><strong>Semantics</strong></span>: Returns the type of an iterator
            to the first element of <code class="computeroutput"><span class="identifier">Seq</span></code>.
          </p>
<h6>
<a name="fusion