><p>If none of the above-listed conditions holds, then <code>NULL</code> is returned.</p></li>
</ol></div>
    <div class="section level2">
    <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
    <div class="dont-index"><p>Other functions that extract parts of oce objects:
<code><a href="sub-sub-adv-method.html">[[,adv-method</a></code>,
<code><a href="sub-sub-amsr-method.html">[[,amsr-method</a></code>,
<code><a href="sub-sub-argo-method.html">[[,argo-method</a></