t corresponds to the index of
 the object in the referenced association or element
 collection.
 This method must only be invoked upon an object that
 represents an association or element collection for
 which an order column has been defined.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>expression denoting the index</dd>
</dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
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