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The Java Persistence API (JPA) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. 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.
 */
package javax.persistence.criteria;

import javax.persistence.metamodel.EntityType;

/**
 * A root type in the from clause. Query roots always reference entities.
 * @param  the entity type referenced by the root
 */
public interface Root extends From
{
    /**
     * Return the metamodel entity corresponding to the root.
     * @return metamodel entity corresponding to the root
     */
    EntityType getModel();
}