* Tries to check whether a validation.xml file exists and parses it using JAXB.
*
* @return The parameters parsed out of <i>validation.xml</i> wrapped in an instance of <code>ConfigurationImpl.ValidationBootstrapParameters</code>.
*/
public ValidationBootstrapParameters parseValidationXml() {
ValidationConfigType config = getValidationConfig();
ValidationBootstrapParameters xmlParameters = new ValidationBootstrapParameters();
if ( config != null ) {
// collect the paramters from the xml file
setProviderClassFromXml( config, xmlParameters );
setMessageInterpolatorFromXml( config, xmlParameters );