 class="returnLabel">Returns:</span></dt>
<dd>the set of descriptors representing the container element types that are
 constrained or are marked with <code>Valid</code>. An empty set will be returned if this
 element is not of a container type or is of a container type but there are no
 container element types hosting constraints or marked with <code>Valid</code>.</dd>
</dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
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