shal-time validation engine.  The client application 
 must properly configure their SAX 2.0 compliant parser to perform
 validation (as shown in the example above).  Any <code>SAXParserExceptions</code>
 encountered by the parser during the unmarshal operation will be
 processed by the Jakarta XML Binding provider and converted into Jakarta XML Binding 
 <code>ValidationEvent</code> objects which will be reported back to the
 client via the <code>ValidationEventHandler</code> registered with the
 <code>Unm