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/*
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.xml.bind.annotation;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * 
 * Maps a JavaBean property to XML ID.
 *
 * 

 * To preserve referential integrity of an object graph across XML
 * serialization followed by a XML deserialization, requires an object
 * reference to be marshalled by reference or containment
 * appropriately. Annotations @XmlID and @XmlIDREF
 * together allow a customized mapping of a JavaBean property's
 * type by containment or reference. 
 *
 * 
Usage 
 * The @XmlID annotation can be used with the following
 * program elements: 
 *  
 *    a JavaBean property 
 *    non static, non transient field 
 * 
 * 
 * See "Package Specification" in javax.xml.bind.package javadoc for
 * additional common information.
 *
 * The usage is subject to the following constraints:
 *  
 *    At most one field or property in a class can be annotated
 *        with @XmlID.  
 *    The JavaBean property's type must be java.lang.String.
 *    The only other mapping annotations that can be used
 *        with @XmlID
 *        are:@XmlElement and @XmlAttribute.  
 * 
 * 
 * Example: Map a JavaBean property's type to xs:ID
 *  *    // Example: code fragment
 *    public class Customer {
 *        @XmlAttribute
 *        @XmlID
 *        public String getCustomerID();
 *        public void setCustomerID(String id);
 *        .... other properties not shown 
 *    }
 *
 *    <!-- Example: XML Schema fragment -->
 *    <xs:complexType name="Customer">
 *      <xs:complexContent>
 *        <xs:sequence>
 *          ....
 *        </xs:sequence>
 *        <xs:attribute name="customerID" type="xs:ID"/>
 *      </xs:complexContent>
 *    </xs:complexType>
 * 
 *
 * @author Sekhar Vajjhala, Sun Microsystems, Inc.
 * @see XmlIDREF
 * @since JAXB2.0
 */

@Retention(RUNTIME) @Target({FIELD, METHOD})
public @interface XmlID { }