/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jackrabbit.core.version;

import org.apache.jackrabbit.core.id.NodeId;

/**
 * This interface defines the base for all internal versioning items. Internal
 * versioning items are decoupled from their external form as exposed to the
 * repository or in form of the node extensions {@link javax.jcr.version.Version}
 * or {@link javax.jcr.version.VersionHistory}.
 */
public interface InternalVersionItem {

    /**
     * Returns the id of this item.
     *
     * @return the id of this item.
     */
    NodeId getId();

    /**
     * returns the parent version item or <code>null</code>.
     *
     * @return the parent version item.
     */
    InternalVersionItem getParent();

}
