enience method. 
<p>
Check if <code>exclusion</code> is a substitution group exclusion for this element 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>exclusion</em>&nbsp;</td><td><code>DERIVATION_EXTENSION, DERIVATION_RESTRICTION</code> or <code>DERIVATION_NONE</code>. Represents final set for the element. </td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>True i