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JAXB (JSR 222) Reference Implementation
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package com.sun.xml.bind;

import javax.xml.bind.ValidationEventLocator;

/**
 * Defines additional accessor methods for the event source location.
 * 
 * This interface exposes the location information only available
 * in the JAXB RI specific extension.
 * 

 * DO NOT IMPLEMENT THIS INTERFACE BY YOUR CODE because
 * we might add more methods on this interface in the future release
 * of the RI.
 * 
 * 
Usage
 * 
 * If you obtain a reference to {@link javax.xml.bind.ValidationEventLocator},
 * check if you can cast it to {@link ValidationEventLocatorEx} first, like this:
 * 
 * void foo( ValidationEvent e ) {
 *     ValidationEventLocator loc = e.getLocator();
 *     if( loc instanceof ValidationEventLocatorEx ) {
 *         String fieldName = ((ValidationEventLocatorEx)loc).getFieldName();
 *         if( fieldName!=null ) {
 *             // do something with location.
 *         }
 *     }
 * }
 * 
 * 
 * @author
 *     Kohsuke Kawaguchi ([email protected])
 */
public interface ValidationEventLocatorEx extends ValidationEventLocator {
    /**
     * Returns the field name of the object where the error occured.
     * 
     * This method always returns null when you are doing
     * a validation during unmarshalling.
     * 
     * When not null, the field name indicates the field of the object
     * designated by the {@link #getObject()} method where the error
     * occured. 
     */
    String getFieldName();
}