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This module contains the Metro runtime code.
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/*
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 *
 * Copyright (c) 2005-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
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 * 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
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 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at LICENSE.txt.
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 * Modifications:
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package com.sun.xml.txw2.annotation;

import com.sun.xml.txw2.TypedXmlWriter;
import com.sun.xml.txw2.TXW;
import com.sun.xml.txw2.output.XmlSerializer;

import javax.xml.namespace.QName;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static java.lang.annotation.ElementType.METHOD;

/**
 * Specifies the name of the XML element.
 *
 * Used on method
 * 
 * When used on methods declared on interfaces that derive
 * from {@link TypedXmlWriter}, it specifies that the invocation
 * of the method will produce an element of the specified name.
 *
 * 

 * The method signature has to match one of the following patterns.
 *
 * 

 *  Child writer: {@code TW foo()}
 *  TW must be an interface derived from {@link TypedXmlWriter}.
 *      When this method is called, a new child element is started,
 *      and its content can be written by using the returned {@code TW}
 *      object. This child element will be ended when its _commit method
 *      is called.
 *  
Leaf element: {@code void foo(DT1,DT2,...)}
 *  DTi must be datatype objects.
 *      When this method is called, a new child element is started,
 *      followed by the whitespace-separated text data from each of
 *      the datatype objects, followed by the end tag.
 * 
 *
 * Used on interface
 * 
 * When used on interfaces that derive from {@link TypedXmlWriter},
 * it associates an element name with that interface. This name is
 * used in a few places, such as in {@link TXW#create(Class,XmlSerializer)}
 * and {@link TypedXmlWriter#_element(Class)}.
 *
 *
 * @author Kohsuke Kawaguchi
 */
@Retention(RUNTIME)
@Target({METHOD,TYPE})
public @interface XmlElement {
    /**
     * The local name of the element.
     */
    String value() default "";

    /**
     * The namespace URI of this element.
     *
     * 

     * If the annotation is on an interface and this paramter is left unspecified,
     * then the namespace URI is taken from {@link XmlNamespace} annotation on
     * the package that the interface is in. If {@link XmlNamespace} annotation
     * doesn't exist, the namespace URI will be "".
     *
     * 
     * If the annotation is on a method and this parameter is left unspecified,
     * then the namespace URI is the same as the namespace URI of the writer interface.
     */
    String ns() default "##default";
}