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/*
* Copyright (c) 2011, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// dmccann - September 14/2010 - 2.2 - Initial implementation
package org.eclipse.persistence.oxm.annotations;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
/**
* <p>XmlKey is used to mark a property as a key, to be referenced using a key-based mapping via {@code XmlJoinNode}. This is
* similar to the {@code XmlID} annotation, but doesn't require the property be bound to the schema type ID. XmlKey is
* typically used in the composite key use case, since only 1 property can be annotated with the XmlID annotation.
* </p>
*
* <p><b>Example:</b>
* <pre>
* &#64;XmlRootElement
* &#64;XmlAccessorType(XmlAccessType.FIELD)
* public class Employee {
*
* &#64;XmlKey
* public String id;
*
* &#64;XmlKey
* public String department;
*
* &#64;XmlJoinNodes({
* &#64;XmlJoinNode(xmlPath="manager/id/text()", referencedXmlPath="id/text()"),
* &#64;XmlJoinNode(xmlPath="manager/dept/text()", referencedXmlPath="department/text()")
* })
* public Employee manager;
* }
* </pre>
*
* @see XmlJoinNode
* @see XmlJoinNodes
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface XmlKey {}