/*
 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.xml.bind.annotation;

import javax.activation.DataHandler;
import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

/**
 * Marks a field/property that its XML form is a uri reference to mime content.
 * The mime content is optimally stored out-of-line as an attachment.
 *
 * A field/property must always map to the {@link DataHandler} class.
 *
 * <h2>Usage</h2>
 * <pre>
 * &#64;{@link XmlRootElement}
 * class Foo {
 *   &#64;{@link XmlAttachmentRef}
 *   &#64;{@link XmlAttribute}
 *   {@link DataHandler} data;
 *
 *   &#64;{@link XmlAttachmentRef}
 *   &#64;{@link XmlElement}
 *   {@link DataHandler} body;
 * }
 * </pre>
 * The above code maps to the following XML:
 * <pre>{@code
 * <xs:element name="foo" xmlns:ref="http://ws-i.org/profiles/basic/1.1/xsd">
 *   <xs:complexType>
 *     <xs:sequence>
 *       <xs:element name="body" type="ref:swaRef" minOccurs="0" />
 *     </xs:sequence>
 *     <xs:attribute name="data" type="ref:swaRef" use="optional" />
 *   </xs:complexType>
 * </xs:element>
 * }</pre>
 *
 * <p>
 * The above binding supports WS-I AP 1.0 <a href="http://www.ws-i.org/Profiles/AttachmentsProfile-1.0-2004-08-24.html#Referencing_Attachments_from_the_SOAP_Envelope">WS-I Attachments Profile Version 1.0.</a>
 *
 * @author Kohsuke Kawaguchi
 * @since 1.6, JAXB 2.0
 */
@Retention(RUNTIME)
@Target({FIELD,METHOD,PARAMETER})
public @interface XmlAttachmentRef {
}