<code>Iterator</code> over the namespace prefix
 <code>String</code>s declared by this element. The prefixes returned by
 this iterator can be passed to the method
 <code>getNamespaceURI</code> to retrieve the URI of each namespace.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an iterator over the namespace prefixes in this
         <code>SOAPElement</code> object</dd>
</dl>
</li>
</ul>
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