/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
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>
*
* <p><b>Example 1:</b> Customize name of XML namespace to which
* package is mapped.</p>
*
* <pre>
* @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 -->
* </pre>
*
* <p><b>Example 2:</b> Customize namespace prefix, namespace URI
* mapping</p>
*
* <pre>
* // 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">
*
* </pre>
*
* <p><b>Example 3:</b> Customize elementFormDefault</p>
* <pre>
* @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">
*
* </pre>
* @author Sekhar Vajjhala, Sun Microsystems, Inc.
* @since JAXB2.0
*/
@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 <tt>http://example.org/some.xsd</tt>.
* 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
* <tt>"##generate"</tt> 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 <tt>""</tt>, <tt>"##generate"</tt>, or
* <a href="http://www.w3.org/TR/xmlschema-2/#anyURI">
* a valid lexical representation of <tt>xs:anyURI</tt></a> that begins
* with <tt><scheme>:</tt>.
*
* <p>
* A schema generator is expected to generate a corresponding
* <tt><xs:import namespace="..." schemaLocation="..."/></tt> (or
* no <tt>schemaLocation</tt> attribute at all if the empty string is specified.)
* However, the schema generator is allowed to use a different value in
* the <tt>schemaLocation</tt> 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 JAXB2.1
*/
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";
}
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