Java Architecture for XML Binding (JAXB) is a Java API that allows Java developers to map Java classes to XML representations.

jaxb-api-2.3.1.jar is the JAR file for the JAXB API 2.3 specification. You can download and use it directly without any building process as shown in the last tutorial.

If you want to rebuild the JAR file, you can download the source code at JAXB API Maven Website.

You can also browse the source code below:

⏎ javax/xml/bind/annotation/XmlSchema.java

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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
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 * Oracle designates this particular file as subject to the "Classpath"
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 * file that accompanied this code.
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 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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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.*;

/**
 * <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.
     */
    XmlNs[]  xmlns() default {};

    /**
     * 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.
     */
    XmlNsForm elementFormDefault() default XmlNsForm.UNSET;

    /**
     * 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 {@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 {@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";
}

⏎ javax/xml/bind/annotation/XmlSchema.java

Or download all of them as a single archive file:

File name: jaxb-api-2.3.1-sources.jar
File size: 271123 bytes
Release date: 2018-10-10
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⇒ Download JAXB 2.2 Specification and API JAR

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⇑ JAXB (Java Architecture for XML Binding) API Specification

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