 the Java content tree (or any sub-tree of it).  All JAXB 1.0
             Providers are required to support this operation.
        </dd>

        <dt><b>Fail-Fast Validation</b></dt>
        <dd> This form of validation enables a client application to receive 
             immediate feedback about modifications to the Java content tree 
             that violate type constraints on Java Properties as defined in 
             the specification.  Jakarta XML Binding Providers are not required support
      