al to traversal. An Associative Sequence
        allows efficient retrieval of elements based on keys.
      </p>
<h5>
<a name="fusion.sequence.concepts.h2"></a>
        <span class="phrase"><a name="fusion.sequence.concepts.boundary"></a></span><a class="link" href="concepts.html#fusion.sequence.concepts.boundary">Boundary</a>
      </h5>
<p>
        The <a class="link" href="concepts/unbounded_sequence.html" title="Unbounded Sequence">Unbounded
        Sequence</a> concept is also orthogonal to traversal 