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xbean-spring provides a schema-driven proprietary namespace handler for spring contexts
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/**
 * 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.xbean.spring.context;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

import org.apache.xbean.spring.context.SpringApplicationContext;
import org.apache.xbean.spring.context.impl.XBeanHelper;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.ResourceEntityResolver;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;

/**
 * An XBean version of the regular Spring class to provide improved XML
 * handling.
 * 
 * @author James Strachan
 * @author Dain Sundstrom
 * @version $Id$
 * @since 2.0
 */
public class XmlWebApplicationContext extends org.springframework.web.context.support.XmlWebApplicationContext implements SpringApplicationContext {
    private final List xmlPreprocessors;

    /**
     * Creates a XmlWebApplicationContext which loads the configuration from the a web application context.
     */
    public XmlWebApplicationContext() {
        this.xmlPreprocessors = Collections.EMPTY_LIST;
    }

    /**
     * Creates a XmlWebApplicationContext which loads the configuration from the a web application context.
     * @param xmlPreprocessors the SpringXmlPreprocessors to apply before passing the xml to Spring for processing
     */
    public XmlWebApplicationContext(List xmlPreprocessors) {
        this.xmlPreprocessors = xmlPreprocessors;
    }

    /**
     * {@inheritDoc}
     */
    protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws IOException {
        // Create a new XmlBeanDefinitionReader for the given BeanFactory.
        XmlBeanDefinitionReader beanDefinitionReader = XBeanHelper.createBeanDefinitionReader(this, beanFactory, xmlPreprocessors);

        // Configure the bean definition reader with this context's
        // resource loading environment.
        beanDefinitionReader.setResourceLoader(this);
        beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));

        // Allow a subclass to provide custom initialization of the reader,
        // then proceed with actually loading the bean definitions.
        initBeanDefinitionReader(beanDefinitionReader);
        loadBeanDefinitions(beanDefinitionReader);
    }
    
}