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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.AbstractObjectCreationFactory;
import org.apache.commons.digester3.FactoryCreateRule;
import org.apache.commons.digester3.annotations.DigesterRule;
import org.apache.commons.digester3.annotations.DigesterRuleList;
import org.apache.commons.digester3.annotations.handlers.FactoryCreateHandler;
import org.xml.sax.Attributes;

/**
 * Classes annotated with {@code FactoryCreate} will be bound with {@code FactoryCreateRule} digester rule.
 * 
 * @see org.apache.commons.digester3.Digester#addFactoryCreate(String,org.apache.commons.digester3.ObjectCreationFactory,boolean)
 * @since 2.1
 */
@Documented
@Retention( RetentionPolicy.RUNTIME )
@Target( ElementType.TYPE )
@CreationRule
@DigesterRule( reflectsRule = FactoryCreateRule.class, handledBy = FactoryCreateHandler.class )
public @interface FactoryCreate
{

    /**
     * The Java class of the object creation factory class.
     */
    Class> factoryClass() default DefaultObjectCreationFactory.class;

    /**
     * Allows specify the attribute containing an override class name if it is present.
     *
     * @since 3.0
     */
    String attributeName() default "";

    /**
     * The element matching pattern.
     */
    String pattern();

    /**
     * The namespace URI for which this Rule is relevant, if any.
     *
     * @since 3.0
     */
    String namespaceURI() default "";

    /**
     * When true any exceptions thrown during object creation will be ignored.
     */
    boolean ignoreCreateExceptions() default false;

    /**
     * Defines several {@code @FactoryCreate} annotations on the same element.
     * 
     * @see FactoryCreate
     */
    @Documented
    @Retention( RetentionPolicy.RUNTIME )
    @Target( ElementType.TYPE )
    @DigesterRuleList
    @interface List
    {
        FactoryCreate[] value();
    }

    /**
     * Dummy ObjectCreationFactory type - only for annotation value type purposes.
     */
    public static final class DefaultObjectCreationFactory
        extends AbstractObjectCreationFactory