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/*******************************************************************************
 * Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
 ******************************************************************************/  
package org.eclipse.persistence.oxm.mappings;

import org.eclipse.persistence.oxm.mappings.nullpolicy.AbstractNullPolicy;


/**
 * INTERNAL
 * All nillable mappings which can be added to org.eclipse.persistence.oxm.XMLDescriptor must
 * implement this interface.

 * The default policy is AbstractNullPolicy.

 *
 *@see org.eclipse.persistence.oxm.mappings
 */
public interface XMLNillableMapping {

    /**
     * Set the AbstractNullPolicy on the mapping

     * The default policy is NullPolicy.

     *
     * @param aNullPolicy
     */
    public void setNullPolicy(AbstractNullPolicy aNullPolicy);

    /**
     * Get the AbstractNullPolicy from the Mapping.

     * The default policy is NullPolicy.

     * @return
     */
    public AbstractNullPolicy getNullPolicy();
}