><span class="identifier">s2</span><span class="special">);</span>                   <span class="comment">// is identical
</span></pre>
<p>
        </p>
<p>
          This might be convenient, if intersection is used like a generalized selection
          function. Using element or segment types for <code class="computeroutput"><span class="identifier">P</span></code>,
          we can select small parts of a container <code class="computeroutput"><span class="identifier">y</span></code>
          and accu