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Commons XMLSchema is a light weight schema object model that can be used to manipualte or generate a schema. It has a clean, easy to use API and can easily be integrated into an existing project since it has almost no dependancies on third party libraries.

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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.ws.commons.schema.extensions;

import org.apache.ws.commons.schema.XmlSchemaObject;
import org.apache.ws.commons.schema.constants.Constants;
import org.w3c.dom.Node;

import javax.xml.namespace.QName;
import java.util.HashMap;
import java.util.Map;

/**
 * Default deserializer. The action taken when there is nothing specific
 * to be done would be to attach the raw element object as it is to the
 * meta information map for an element or the raw attribute object
 *
 */
public class DefaultExtensionDeserializer implements ExtensionDeserializer {

    /**
     * deserialize the given element
     *
     * @param schemaObject - Parent schema element
     * @param name         - the QName of the element/attribute to be deserialized.
     *                     in the case where a deserializer is used to handle multiple elements/attributes
     *                     this may be useful to determine the correct deserialization
     * @param node - the raw DOM Node read from the source. This will be the
     * extension element itself if for an element or the extension attribute object if
     * it is an attribute
     */
    public void deserialize(XmlSchemaObject schemaObject, QName name, Node node) {

        // we just attach the raw node either to the meta map of
        // elements or the attributes
    	
        Map metaInfoMap =  schemaObject.getMetaInfoMap();
        if (metaInfoMap==null){
        	metaInfoMap = new HashMap();
        }



        if (node.getNodeType()==Node.ATTRIBUTE_NODE){

            Map attribMap; 
            if (metaInfoMap.containsKey(Constants.MetaDataConstants.EXTERNAL_ATTRIBUTES)){
                attribMap  = (Map)metaInfoMap.get(Constants.MetaDataConstants.EXTERNAL_ATTRIBUTES);
            }else{
                attribMap = new HashMap();
                metaInfoMap.put(Constants.MetaDataConstants.EXTERNAL_ATTRIBUTES,attribMap);
            }
            attribMap.put(name,node);

        }else if (node.getNodeType()==Node.ELEMENT_NODE){
            Map elementMap;
            if (metaInfoMap.containsKey(Constants.MetaDataConstants.EXTERNAL_ELEMENTS)){
                elementMap  = (Map)metaInfoMap.get(Constants.MetaDataConstants.EXTERNAL_ELEMENTS);
            }else{
                elementMap = new HashMap();
                metaInfoMap.put(Constants.MetaDataConstants.EXTERNAL_ELEMENTS,elementMap);
            }
            elementMap.put(name,node);
        }

        //subsequent processing takes place only if this map is not empty
        if (!metaInfoMap.isEmpty()){
            Map metaInfoMapFromSchemaElement = schemaObject.getMetaInfoMap();
            if (metaInfoMapFromSchemaElement==null){
                schemaObject.setMetaInfoMap(metaInfoMap);
            }else{
                metaInfoMapFromSchemaElement.putAll(metaInfoMap);
            }

        }


    }
}