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Convenience method. 
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Returns a top-level notation declaration. <dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>name</em>&nbsp;</td><td>The name of the declaration. </td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>A top-level notation declaration or <code>null</code> if such declaration does not exist. </dd></dl>

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