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The Apache Commons Digester package lets you configure an XML to Java object mapping module which triggers certain actions called rules whenever a particular pattern of nested XML elements is recognized.

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package org.apache.commons.digester3.annotations.rules;

/*
 * 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.
 */

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import org.apache.commons.digester3.SetRootRule;
import org.apache.commons.digester3.annotations.DigesterRule;
import org.apache.commons.digester3.annotations.handlers.SetRootHandler;

/**
 * Methods annotated with {@code SetRoot} will be bound with {@code SetRootRule} digester rule.
 * 
 * @see org.apache.commons.digester3.Digester#addSetRoot(String,String,String)
 * @since 2.1
 */
@Documented
@Retention( RetentionPolicy.RUNTIME )
@Target( ElementType.METHOD )
@DigesterRule( reflectsRule = SetRootRule.class, handledBy = SetRootHandler.class )
public @interface SetRoot
{

    /**
     * Defines the concrete implementation(s) of @SetRoot annotated method argument.
     */
    Class[] value() default { };

    /**
     * Marks the rule be invoked when {@code begin} or {@code end} events match.
     */
    boolean fireOnBegin() default false;

}