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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2004-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package javax.xml.bind.annotation;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.FIELD;

/**
 * Maps an enum constant in {@link Enum} type to XML representation.  
 * 
 *  Usage 
 *
 *  The @XmlEnumValue annotation can be used with the
 *     following program elements:  
 * 
 
 *   enum constant
 * 
 *
 * See "Package Specification" in javax.xml.bind.package javadoc for
 * additional common information.
 *
 * This annotation, together with {@link XmlEnum} provides a
 * mapping of enum type to XML representation.
 *
 * 
An enum type is mapped to a schema simple type with enumeration
 * facets. The schema type is derived from the Java type specified in
 * @XmlEnum.value(). Each enum constant @XmlEnumValue
 * must have a valid lexical representation for the type
 * @XmlEnum.value() 
 *
 * 
 In the absence of this annotation, {@link Enum#name()} is used
 * as the XML representation.
 *
 * 
 Example 1: Map enum constant name -> enumeration facet
 *  *     //Example: Code fragment
 *     @XmlEnum(String.class)
 *     public enum Card { CLUBS, DIAMONDS, HEARTS, SPADES }
 *
 *     <!-- Example: XML Schema fragment -->
 *     <xs:simpleType name="Card">
 *       <xs:restriction base="xs:string"/>
 *         <xs:enumeration value="CLUBS"/>
 *         <xs:enumeration value="DIAMONDS"/>
 *         <xs:enumeration value="HEARTS"/>
 *         <xs:enumeration value="SPADES"/>
 *     </xs:simpleType>
 * 
 *
 * Example 2: Map enum constant name(value) -> enumeration facet 
 *  *     //Example: code fragment
 *     @XmlType
 *     @XmlEnum(Integer.class)
 *     public enum Coin { 
 *         @XmlEnumValue("1") PENNY(1),
 *         @XmlEnumValue("5") NICKEL(5),
 *         @XmlEnumValue("10") DIME(10),
 *         @XmlEnumValue("25") QUARTER(25) }
 *
 *     <!-- Example: XML Schema fragment -->
 *     <xs:simpleType name="Coin">
 *       <xs:restriction base="xs:int">
 *         <xs:enumeration value="1"/>
 *         <xs:enumeration value="5"/>
 *         <xs:enumeration value="10"/>
 *         <xs:enumeration value="25"/>
 *       </xs:restriction>
 *     </xs:simpleType>
 * 
 *
 * Example 3: Map enum constant name -> enumeration facet 
 * 
 *  *     //Code fragment
 *     @XmlType
 *     @XmlEnum(Integer.class)
 *     public enum Code {
 *         @XmlEnumValue("1") ONE,
 *         @XmlEnumValue("2") TWO;
 *     }
 * 
 *     <!-- Example: XML Schema fragment -->
 *     <xs:simpleType name="Code">
 *       <xs:restriction base="xs:int">
 *         <xs:enumeration value="1"/>
 *         <xs:enumeration value="2"/>
 *       </xs:restriction>
 *     </xs:simpleType>
 * 
 *
 * @since JAXB 2.0
 */
@Retention(RUNTIME)
@Target({FIELD})
public @interface XmlEnumValue {
    String value();
}