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* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
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.*;
/**
* <p>
* Maps a JavaBean property to XML ID.
*
* <p>
* 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 {@code @XmlID} and {@code @XmlIDREF}
* together allow a customized mapping of a JavaBean property's
* type by containment or reference.
*
* <p><b>Usage</b> </p>
* The {@code @XmlID} annotation can be used with the following
* program elements:
* <ul>
* <li> a JavaBean property </li>
* <li> non static, non transient field </li>
* </ul>
*
* <p>See "Package Specification" in javax.xml.bind.package javadoc for
* additional common information.</p>
*
* The usage is subject to the following constraints:
* <ul>
* <li> At most one field or property in a class can be annotated
* with {@code @XmlID}. </li>
* <li> The JavaBean property's type must be {@code java.lang.String}.</li>
* <li> The only other mapping annotations that can be used
* with {@code @XmlID}
* are: {@code @XmlElement} and {@code @XmlAttribute}.</li>
* </ul>
*
* <p><b>Example</b>: Map a JavaBean property's type to {@code xs:ID}</p>
* <pre>
* // Example: code fragment
* public class Customer {
* @XmlAttribute
* @XmlID
* public String getCustomerID();
* public void setCustomerID(String id);
* .... other properties not shown
* }
* {@code
*
* <!-- 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>
* }</pre>
*
* @author Sekhar Vajjhala, Sun Microsystems, Inc.
* @see XmlIDREF
* @since 1.6, JAXB 2.0
*/
@Retention(RUNTIME) @Target({FIELD, METHOD})
public @interface XmlID { }