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<div class="subTitle">javax.xml.bind.annotation</div>
<h2 title="Annotation Type XmlRootElement" class="title">Annotation Type XmlRootElement</h2>
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<pre>@Retention(value=RUNTIME)
@Target(value=TYPE)
public @interface <span class="memberNameLabel">XmlRootElement</span></pre>
<div class="block">Maps a class or an enum type to an XML element.
<p> <b>Usage</b> </p>
<p>
The &#64;XmlRootElement annotation can be used with the following program
elements:
<ul>
<li> a top level class </li>
<li> an enum type </li>
</ul>
<p>See "Package Specification" in javax.xml.bind.package javadoc for
additional common information.</p>
<p>
When a top level class or an enum type is annotated with the
&#64;XmlRootElement annotation, then its value is represented
as XML element in an XML document.
<p> This annotation can be used with the following annotations:
<a href="../../../../javax/xml/bind/annotation/XmlType.html" title="annotation in javax.xml.bind.annotation"><code>XmlType</code></a>, <a href="../../../../javax/xml/bind/annotation/XmlEnum.html" title="annotation in javax.xml.bind.annotation"><code>XmlEnum</code></a>, <a href="../../../../javax/xml/bind/annotation/XmlAccessorType.html" title="annotation in javax.xml.bind.annotation"><code>XmlAccessorType</code></a>,
<a href="../../../../javax/xml/bind/annotation/XmlAccessorOrder.html" title="annotation in javax.xml.bind.annotation"><code>XmlAccessorOrder</code></a>.
</p>
<p>
<b>Example 1: </b> Associate an element with XML Schema type
<pre>
// Example: Code fragment
&#64;XmlRootElement
class Point {
int x;
int y;
Point(int _x,int _y) {x=_x;y=_y;}
}
</pre>
<pre>
//Example: Code fragment corresponding to XML output
marshal( new Point(3,5), System.out);
</pre>
<pre><code>
&lt;!-- Example: XML output --&gt;
&lt;point&gt;
&lt;x&gt; 3 &lt;/x&gt;
&lt;y&gt; 5 &lt;/y&gt;
&lt;/point&gt;
</code></pre>
The annotation causes an global element declaration to be produced
in the schema. The global element declaration is associated with
the XML schema type to which the class is mapped.
<pre><code>
&lt;!-- Example: XML schema definition --&gt;
&lt;xs:element name="point" type="point"/&gt;
&lt;xs:complexType name="point"&gt;
&lt;xs:sequence&gt;
&lt;xs:element name="x" type="xs:int"/&gt;
&lt;xs:element name="y" type="xs:int"/&gt;
&lt;/xs:sequence&gt;
&lt;/xs:complexType&gt;
</code></pre>
<p>
<b>Example 2: Orthogonality to type inheritance </b>
<p>
An element declaration annotated on a type is not inherited by its
derived types. The following example shows this.
<pre>
// Example: Code fragment
&#64;XmlRootElement
class Point3D extends Point {
int z;
Point3D(int _x,int _y,int _z) {super(_x,_y);z=_z;}
}
//Example: Code fragment corresponding to XML output *
marshal( new Point3D(3,5,0), System.out );
<code>
&lt;!-- Example: XML output --&gt;
&lt;!-- The element name is point3D not point --&gt;
&lt;point3D&gt;
&lt;x&gt;3&lt;/x&gt;
&lt;y&gt;5&lt;/y&gt;
&lt;z&gt;0&lt;/z&gt;
&lt;/point3D&gt;
&lt;!-- Example: XML schema definition --&gt;
&lt;xs:element name="point3D" type="point3D"/&gt;
&lt;xs:complexType name="point3D"&gt;
&lt;xs:complexContent&gt;
&lt;xs:extension base="point"&gt;
&lt;xs:sequence&gt;
&lt;xs:element name="z" type="xs:int"/&gt;
&lt;/xs:sequence&gt;
&lt;/xs:extension&gt;
&lt;/xs:complexContent&gt;
&lt;/xs:complexType&gt;
</code></pre>
<b>Example 3: </b> Associate a global element with XML Schema type
to which the class is mapped.
<pre>
//Example: Code fragment
&#64;XmlRootElement(name="PriceElement")
public class USPrice {
&#64;XmlElement
public java.math.BigDecimal price;
}
<code>
&lt;!-- Example: XML schema definition --&gt;
&lt;xs:element name="PriceElement" type="USPrice"/&gt;
&lt;xs:complexType name="USPrice"&gt;
&lt;xs:sequence&gt;
&lt;xs:element name="price" type="xs:decimal"/&gt;
&lt;/sequence&gt;
&lt;/xs:complexType&gt;
</code></pre></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.6, JAXB 2.0</dd>
</dl>
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<h3>Optional Element Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation">
<caption><span>Optional Elements</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Optional Element and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/xml/bind/annotation/XmlRootElement.html#name--">name</a></span></code>
<div class="block">local name of the XML element.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../javax/xml/bind/annotation/XmlRootElement.html#namespace--">namespace</a></span></code>
<div class="block">namespace name of the XML element.</div>
</td>
</tr>
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<h4>namespace</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;namespace</pre>
<div class="block">namespace name of the XML element.
<p>
If the value is "##default", then the XML namespace name is derived
from the package of the class ( <a href="../../../../javax/xml/bind/annotation/XmlSchema.html" title="annotation in javax.xml.bind.annotation"><code>XmlSchema</code></a> ). If the
package is unnamed, then the XML namespace is the default empty
namespace.</div>
<dl>
<dt>Default:</dt>
<dd>"##default"</dd>
</dl>
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<h4>name</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;name</pre>
<div class="block">local name of the XML element.
<p>
If the value is "##default", then the name is derived from the
class name.</div>
<dl>
<dt>Default:</dt>
<dd>"##default"</dd>
</dl>
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