n null
 indicating that unmarshal-time validation will not be performed.
 <p>
 This method provides replacement functionality for the deprecated
 <a href="#isValidating()"><code>isValidating()</code></a> API as well as access to the Schema object.
 To determine if the Unmarshaller has validation enabled, simply
 test the return type for null:
 <pre><code>
   boolean isValidating = u.getSchema()!=null;
 </code></pre></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the Schema object being us