https://github.com/eclipse-ee4j/jaxb-api/jakarta.xml.bind-api: Jakarta XML Binding API (Eclipse Foundation)
  • Roman Grigoriadi (Oracle Corporation) 
/*
 * Copyright (c) 2004, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package javax.xml.bind.annotation;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

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


 Maps a package name to a XML namespace. 


Usage



The XmlSchema annotation can be used with the following program
elements:

     
  
  • package
    • 




This is a package level annotation and follows the recommendations
and restrictions contained in JSR 175, section III, "Annotations".
Thus the usage is subject to the following constraints and
recommendations.

    
  
  •  There can only be one package declaration as noted in JSR
       175, section III, "Annotations". 
    • 
  
  •  JSR 175 recommends package-info.java for package level
       annotations. JAXB Providers that follow this recommendation
       will allow the package level annotations to be defined in
       package-info.java.



Example 1: Customize name of XML namespace to which 
package is mapped.


 @javax.xml.bind.annotation.XmlSchema ( namespace = "http://www.example.com/MYPO1" )   
   <!-- XML Schema fragment -->
   <schema
     xmlns=...
     xmlns:po=....
     targetNamespace="http://www.example.com/MYPO1"
   >
   <!-- prefixes generated by default are implementation
           depedenent -->



Example 2: Customize namespace prefix, namespace URI
mapping


 // Package level annotation @javax.xml.bind.annotation.XmlSchema ( xmlns = { @javax.xml.bind.annotation.XmlNs(prefix = "po", namespaceURI="http://www.example.com/myPO1"), @javax.xml.bind.annotation.XmlNs(prefix="xs", namespaceURI="http://www.w3.org/2001/XMLSchema") } ) 
   <!-- XML Schema fragment -->
   <schema
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       xmlns:po="http://www.example.com/PO1"
       targetNamespace="http://www.example.com/PO1">



Example 3: Customize elementFormDefault


 @javax.xml.bind.annotation.XmlSchema ( elementFormDefault=XmlNsForm.UNQUALIFIED ... ) 
   <!-- XML Schema fragment -->
   <schema
       xmlns="http://www.w3.org/2001/XMLSchema"
       xmlns:po="http://www.example.com/PO1"
       elementFormDefault="unqualified">



Author:Sekhar Vajjhala, Sun Microsystems, Inc.
Since:1.6, JAXB 2.0
/**
 * <p> Maps a package name to a XML namespace. </p>
 *
 * <h3>Usage</h3>
 * <p>
 * The XmlSchema annotation can be used with the following program
 * elements:
 * <ul> 
 *   <li>package</li>
 * </ul>
 *
 * <p>
 * This is a package level annotation and follows the recommendations
 * and restrictions contained in JSR 175, section III, "Annotations".
 * Thus the usage is subject to the following constraints and
 * recommendations.
 * <ul>
 *   <li> There can only be one package declaration as noted in JSR
 *        175, section III, "Annotations". </li>
 *   <li> JSR 175 recommends package-info.java for package level
 *        annotations. JAXB Providers that follow this recommendation
 *        will allow the package level annotations to be defined in
 *        package-info.java.
 * </ul>
 *
 * <p><b>Example 1:</b> Customize name of XML namespace to which 
 * package is mapped.</p>
 *
 * <pre>
 *    &#64;javax.xml.bind.annotation.XmlSchema (
 *      namespace = "http://www.example.com/MYPO1"
 *    )
 * {@code   
 * 
 *    <!-- XML Schema fragment -->
 *    <schema
 *      xmlns=...
 *      xmlns:po=....
 *      targetNamespace="http://www.example.com/MYPO1"
 *    >
 *    <!-- prefixes generated by default are implementation
 *            depedenent -->
 * }</pre>
 *
 * <p><b>Example 2:</b> Customize namespace prefix, namespace URI
 * mapping</p>
 *
 * <pre>
 *    // Package level annotation
 *    &#64;javax.xml.bind.annotation.XmlSchema (
 *      xmlns = { 
 *        &#64;javax.xml.bind.annotation.XmlNs(prefix = "po", 
 *                   namespaceURI="http://www.example.com/myPO1"),
 *
 *        &#64;javax.xml.bind.annotation.XmlNs(prefix="xs",
 *                   namespaceURI="http://www.w3.org/2001/XMLSchema")
 *      }
 *    )
 * {@code
 * 
 *    <!-- XML Schema fragment -->
 *    <schema
 *        xmlns:xs="http://www.w3.org/2001/XMLSchema"
 *        xmlns:po="http://www.example.com/PO1"
 *        targetNamespace="http://www.example.com/PO1">
 * 
 * }</pre>
 *
 * <p><b>Example 3:</b> Customize elementFormDefault</p>
 * <pre>
 *    &#64;javax.xml.bind.annotation.XmlSchema (
 *      elementFormDefault=XmlNsForm.UNQUALIFIED
 *      ...
 *    )
 * {@code
 * 
 *    <!-- XML Schema fragment -->
 *    <schema
 *        xmlns="http://www.w3.org/2001/XMLSchema"
 *        xmlns:po="http://www.example.com/PO1"
 *        elementFormDefault="unqualified">
 * 
 * }</pre>

 * @author Sekhar Vajjhala, Sun Microsystems, Inc.
 * @since 1.6, JAXB 2.0
 */

@Retention(RUNTIME) @Target(PACKAGE)
public @interface XmlSchema {

    
Customize the namespace URI, prefix associations. By default,
the namespace prefixes for a XML namespace are generated by a
JAXB Provider in an implementation dependent way.

/**
     * Customize the namespace URI, prefix associations. By default,
     * the namespace prefixes for a XML namespace are generated by a
     * JAXB Provider in an implementation dependent way.
     */
    XmlNs[]  xmlns() default {};

    
Name of the XML namespace.

/**
     * Name of the XML namespace.
     */
    String namespace() default "";

    
Namespace qualification for elements. By default, element 
default attribute will be absent from the XML Schema fragment.

/**
     * Namespace qualification for elements. By default, element 
     * default attribute will be absent from the XML Schema fragment.
     */
    XmlNsForm elementFormDefault() default XmlNsForm.UNSET;

    
Namespace qualification for attributes. By default,
attributesFormDefault will be absent from the XML Schema fragment.

/**
     * Namespace qualification for attributes. By default,
     * attributesFormDefault will be absent from the XML Schema fragment.
     */
    XmlNsForm attributeFormDefault() default XmlNsForm.UNSET;

    
Indicates that this namespace (specified by namespace()) has a schema already available exeternally, available at this location. 

This instructs the JAXB schema generators to simply refer to
the pointed schema, as opposed to generating components into the schema.
This schema is assumed to match what would be otherwise produced
by the schema generator (same element names, same type names...)


This feature is intended to be used when a set of the Java classes
is originally generated from an existing schema, hand-written to
match externally defined schema, or the generated schema is modified
manually.

 Value could be any absolute URI, like http://example.org/some.xsd. It is also possible to specify the empty string, to indicate that the schema is externally available but the location is unspecified (and thus it's the responsibility of the reader of the generate schema to locate it.) Finally, the default value of this property "##generate" indicates that the schema generator is going to generate components for this namespace (as it did in JAXB 2.0.) 
 Multiple XmlSchema annotations on multiple packages are allowed to govern the same namespace(). In such case, all of them must have the same location() values. 
Note to implementor


 More precisely, the value must be either "", "##generate", or  a valid lexical representation of xs:anyURI that begins with <scheme>:. 
 A schema generator is expected to generate a corresponding <xs:import namespace="..." schemaLocation="..."/> (or no schemaLocation attribute at all if the empty string is specified.) However, the schema generator is allowed to use a different value in the schemaLocation attribute (including not generating such attribute), for example so that the user can specify a local copy of the resource through the command line interface. 
Since:1.6, JAXB 2.1
/**
     * Indicates that this namespace (specified by {@link #namespace()})
     * has a schema already available exeternally, available at this location.
     *
     * <p>
     * This instructs the JAXB schema generators to simply refer to
     * the pointed schema, as opposed to generating components into the schema.
     * This schema is assumed to match what would be otherwise produced
     * by the schema generator (same element names, same type names...)
     *
     * <p>
     * This feature is intended to be used when a set of the Java classes
     * is originally generated from an existing schema, hand-written to
     * match externally defined schema, or the generated schema is modified
     * manually.
     *
     * <p>
     * Value could be any absolute URI, like {@code http://example.org/some.xsd}.
     * It is also possible to specify the empty string, to indicate
     * that the schema is externally available but the location is
     * unspecified (and thus it's the responsibility of the reader of the generate
     * schema to locate it.) Finally, the default value of this property
     * {@code "##generate"} indicates that the schema generator is going
     * to generate components for this namespace (as it did in JAXB 2.0.)
     *
     * <p>
     * Multiple {@link XmlSchema} annotations on multiple packages are allowed
     * to govern the same {@link #namespace()}. In such case, all of them
     * must have the same {@link #location()} values.
     *
     *
     * <h3>Note to implementor</h3>
     * <p>
     * More precisely, the value must be either {@code ""}, {@code "##generate"}, or
     * <a href="http://www.w3.org/TR/xmlschema-2/#anyURI">
     * a valid lexical representation of {@code xs:anyURI}</a> that begins
     * with {@code <scheme>:}.
     *
     * <p>
     * A schema generator is expected to generate a corresponding
     * {@code <xs:import namespace="..." schemaLocation="..."/>} (or
     * no {@code schemaLocation} attribute at all if the empty string is specified.)
     * However, the schema generator is allowed to use a different value in
     * the {@code schemaLocation} attribute (including not generating
     * such attribute), for example so that the user can specify a local
     * copy of the resource through the command line interface.
     *
     * @since 1.6, JAXB 2.1
     */
    String location() default NO_LOCATION;

    
The default value of the location() attribute, which indicates that the schema generator will generate components in this namespace. 
/**
     * The default value of the {@link #location()} attribute,
     * which indicates that the schema generator will generate
     * components in this namespace.
     */
    // the actual value is chosen because ## is not a valid
    // sequence in xs:anyURI.
    static final String NO_LOCATION = "##generate";
}