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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.w3c.dom.Node;

import javax.xml.namespace.QName;

/**
 * Interface for the extension deserializer. The purpose of an instance
 * of this is to deserialize the relevant attribute/element and perhaps generate
 * a desired custom object. This custom object can be stored in the metadata map
 * of the parent schema object. When to invoke a given deserializer is a decision
 * taken by the extension registry
 */
public interface 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 domNode - 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 domNode);

}