/*******************************************************************************
 * Copyright (c) 2007, 2010 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.core.context.persistence;

import org.eclipse.jpt.core.context.XmlFile;

/**
 * JPA <code>persistence.xml</code> file.
 * <p>
 * Provisional API: This interface is part of an interim API that is still
 * under development and expected to change significantly before reaching
 * stability. It is available at this early stage to solicit feedback from
 * pioneering adopters on the understanding that any code that uses this API
 * will almost certainly be broken (repeatedly) as the API evolves.
 * 
 * @version 2.3
 * @since 2.0
 */
public interface PersistenceXml
	extends XmlFile
{
	// ********** persistence **********
	
	/**
	 * String constant associated with changes to the persistence property
	 */
	public final static String PERSISTENCE_PROPERTY = "persistence"; //$NON-NLS-1$
	
	/**
	 * Return the content represented by the root of the <code>persistence.xml</code> file.
	 * This may be null.
	 */
	Persistence getPersistence();
	
	
	// ********** updating **********
	
	/**
	 * Update the context persistence XML model to match its resource file.
	 * @see org.eclipse.jpt.core.JpaProject#update()
	 */
	void update();
}