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 <div class="sect1"><!-- infolevel="all" infotype="General" -->
 <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Defining the Default Root Element</font></h1>
 <p>At least one of your mapped classes must have a default root element defined. This tells EclipseLink what the top-level root of your XML document will be. Consider the <strong>Customer</strong> and <strong>Address</strong> classes shown in <a href="#CIHDBEDH">Figure 3-1</a>:</p>
 <div class="figure"><a id="CIHDBEDH" name="CIHDBEDH"></a><a id="TLJAX187" name="TLJAX187"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Figure 3-1 Sample Mapped Classes</font></em></strong></p>
 <img src="img/defaultrootelement.gif" alt="Sample Mapped Classes" title="Sample Mapped Classes" longdesc="img_text/defaultrootelement.htm" /><br />
 <a id="sthref57" name="sthref57" href="img_text/defaultrootelement.htm">Description of "Figure 3-1 Sample Mapped Classes"</a><br />
 <br /></div>
 <!-- class="figure" -->
 <p>These classes correspond to the XML schema shown in <a href="#CIHFBEII">Example 3-1</a>. The schema contains a top-level element of type <code>customer-type</code>, therefore our <strong>Customer</strong> class will need to have a default root element specified.</p>
 <div class="example"><a id="CIHFBEII" name="CIHFBEII"></a><a id="TLJAX188" name="TLJAX188"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 3-1 Sample XML Schema</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;xsd:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt;
    &lt;xsd:complexType name="address-type"&gt;
       &lt;xsd:sequence&gt;
          &lt;element name="street" type="xsd:string"/&gt;
          &lt;element name="city" type="xsd:string"/&gt;
       &lt;/xsd:sequence&gt;
    &lt;/xsd:complexType&gt;

    &lt;xsd:element <strong>name="customer" type="customer-type"</strong>/&gt;

    &lt;xsd:complexType name="customer-type"&gt;
       &lt;xsd:sequence&gt;
          &lt;xsd:element name="name" type="xsd:string"/&gt;
          &lt;xsd:element name="billing-address" type="address-type"/&gt;
          &lt;xsd:element name="shipping-address" type="address-type"/&gt;
       &lt;/xsd:sequence&gt;
    &lt;/xsd:complexType&gt;
 &lt;/xsd:schema&gt;

 </pre></div>
 <!-- class="example" -->
 <p><a href="#CIHGHJDA">Example 3-2</a> shows how to annotate your Java class to specify a default root element. All that is needed is the standard JAXB <code>@XmlRootElement</code> annotation.</p>
 <div class="example"><a id="CIHGHJDA" name="CIHGHJDA"></a><a id="TLJAX189" name="TLJAX189"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 3-2 Using the @XmlRootElement Annotation</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 package example;

 import javax.xml.bind.annotation.*;

 <strong>@XmlRootElement</strong>
 public class Customer {
    private String name;

    @XmlElement(name="billing-address")
    private Address billingAddress;

    @XmlElement(name="shipping-address")
    private Address shippingAddress;

    ...
 }

 </pre></div>
 <!-- class="example" -->
 <p><a href="#CIHFDJCE">Example 3-3</a> shows how specify a default root element in EclipseLink's OXM metadata format.</p>
 <div class="example"><a id="CIHFDJCE" name="CIHFDJCE"></a><a id="TLJAX190" name="TLJAX190"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 3-3 Specifying a Default Root Element</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 ...
 &lt;java-type name="Customer"&gt;
    &lt;<strong>xml-root-element</strong>/&gt;
    &lt;java-attributes&gt;
       &lt;xml-element java-attribute="name"/&gt;
       &lt;xml-element java-attribute="billingAddress" name="billing-address"/&gt;
       &lt;xml-element java-attribute="shippingAddress" name="shipping-address"/&gt;
    &lt;/java-attributes&gt;
 &lt;/java-type&gt;
 ...

 </pre></div>
 <!-- class="example" -->
 <a id="TLJAX191" name="TLJAX191"></a>
 <div class="sect2"><a id="sthref58" name="sthref58"></a>
 <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Customizing the Default Root Element</font></h2>
 <p>In <a href="#CIHGHJDA">Example 3-2</a>, our class is called <strong>Customer</strong>, and our root element name in XML is <code>customer</code>. By default, when <code>@XmlRootElement</code> is specified, the name of the class has its first letter lower-cased, and this is set as the root element name. If, however, the element name in XML is different from the Java class name, a name attribute can be included in the annotation (as in <a href="#CIHCGICI">Example 3-4</a>) or OXM metadata (as in <a href="#CIHHJIHH">Example 3-5</a>):</p>
 <div class="example"><a id="CIHCGICI" name="CIHCGICI"></a><a id="TLJAX192" name="TLJAX192"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 3-4 Using Annotations</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 package example;

 import javax.xml.bind.annotation.*;

 <strong>@XmlRootElement</strong>(name="my-customer")
 public class Customer {
    private String name;

    @XmlElement(name="billing-address")
    private Address billingAddress;

    @XmlElement(name="shipping-address")
    private Address shippingAddress;

    ...
 }

 </pre></div>
 <!-- class="example" -->
 <div class="example"><a id="CIHHJIHH" name="CIHHJIHH"></a><a id="TLJAX193" name="TLJAX193"></a>
 <p><strong><em><font face="arial, helvetica, sans-serif">Example 3-5 Using OXM Metadata</font></em></strong></p>
 <pre xml:space="preserve" class="oac_no_warn">
 ...
 &lt;java-type name="Customer"&gt;
   <strong> &lt;xml-root-element name="my-customer"/&gt;</strong>
    &lt;java-attributes&gt;
       &lt;xml-element java-attribute="name"/&gt;
       &lt;xml-element java-attribute="billingAddress" name="billing-address"/&gt;
       &lt;xml-element java-attribute="shippingAddress" name="shipping-address"/&gt;
    &lt;/java-attributes&gt;
 &lt;/java-type&gt;
 ...

 </pre></div>
 <!-- class="example" -->
 <p>For more information on JAXB name-binding algorithms, see "Appendix D: Binding XML Names to Java Identifiers" of the Java Architecture for XML Binding (JAXB) Specification (<code><a href="http://jcp.org/en/jsr/detail?id=222">http://jcp.org/en/jsr/detail?id=222</a></code>).</p>
 </div>
 <!-- class="sect2" -->
 <a id="TLJAX194" name="TLJAX194"></a>
 <div class="sect2"><a id="sthref59" name="sthref59"></a>
 <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Understanding How EclipseLink Uses the Default Root Element</font></h2>
 <p>When an instance of the <strong>Customer</strong> class is persisted to XML, the EclipseLink runtime performs the following:</p>
 <ul>
 <li>
 <p>Gets the default root element. The <strong>Customer</strong> class instance corresponds to the root of the XML document. The EclipseLink runtime uses the default root element (<code>customer</code>) specified in either annotations or OXM to start the XML document. EclipseLink then uses the mappings on the class to marshal the object's attributes.</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;customer&gt;
    &lt;name&gt;...&lt;/name&gt;
 &lt;/customer&gt;

 </pre></li>
 <li>
 <p>When the EclipseLink runtime encounters an object attribute such as <code>billingAddress</code>, it checks the mapping associated with it to determine with what element (billing-<code>address</code>) to continue.</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;customer&gt;
    &lt;name&gt;...&lt;/name&gt;
    &lt;billing-address/&gt;
 &lt;/customer&gt;

 </pre></li>
 <li>
 <p>The EclipseLink runtime checks the mapping's reference descriptor (<strong>Address</strong>) to determine what attributes to persist.</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;customer&gt;
    &lt;name&gt;...&lt;/name&gt;
    &lt;billing-address&gt;
       &lt;street&gt;...&lt;/street&gt;
       &lt;city&gt;...&lt;/city&gt;
    &lt;/billing-address&gt;
 &lt;/customer&gt;
 </pre></li>
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	<div class="sect1"><!-- infolevel="all" infotype="General" -->
	<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Defining the Default Root Element</font></h1>
	<p>At least one of your mapped classes must have a default root element defined. This tells EclipseLink what the top-level root of your XML document will be. Consider the <strong>Customer</strong> and <strong>Address</strong> classes shown in <a href="#CIHDBEDH">Figure 3-1</a>:</p>
	<div class="figure"><a id="CIHDBEDH" name="CIHDBEDH"></a><a id="TLJAX187" name="TLJAX187"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Figure 3-1 Sample Mapped Classes</font></em></strong></p>
	<img src="img/defaultrootelement.gif" alt="Sample Mapped Classes" title="Sample Mapped Classes" longdesc="img_text/defaultrootelement.htm" /><br />
	<a id="sthref57" name="sthref57" href="img_text/defaultrootelement.htm">Description of "Figure 3-1 Sample Mapped Classes"</a><br />
	<br /></div>
	<!-- class="figure" -->
	<p>These classes correspond to the XML schema shown in <a href="#CIHFBEII">Example 3-1</a>. The schema contains a top-level element of type <code>customer-type</code>, therefore our <strong>Customer</strong> class will need to have a default root element specified.</p>
	<div class="example"><a id="CIHFBEII" name="CIHFBEII"></a><a id="TLJAX188" name="TLJAX188"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 3-1 Sample XML Schema</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	<xsd:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xsd:complexType name="address-type">
	<xsd:sequence>
	<element name="street" type="xsd:string"/>
	<element name="city" type="xsd:string"/>
	</xsd:sequence>
	</xsd:complexType>

	<xsd:element <strong>name="customer" type="customer-type"</strong>/>

	<xsd:complexType name="customer-type">
	<xsd:sequence>
	<xsd:element name="name" type="xsd:string"/>
	<xsd:element name="billing-address" type="address-type"/>
	<xsd:element name="shipping-address" type="address-type"/>
	</xsd:sequence>
	</xsd:complexType>
	</xsd:schema>

	</pre></div>
	<!-- class="example" -->
	<p><a href="#CIHGHJDA">Example 3-2</a> shows how to annotate your Java class to specify a default root element. All that is needed is the standard JAXB <code>@XmlRootElement</code> annotation.</p>
	<div class="example"><a id="CIHGHJDA" name="CIHGHJDA"></a><a id="TLJAX189" name="TLJAX189"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 3-2 Using the @XmlRootElement Annotation</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	package example;

	import javax.xml.bind.annotation.*;

	<strong>@XmlRootElement</strong>
	public class Customer {
	private String name;

	@XmlElement(name="billing-address")
	private Address billingAddress;

	@XmlElement(name="shipping-address")
	private Address shippingAddress;

	...
	}

	</pre></div>
	<!-- class="example" -->
	<p><a href="#CIHFDJCE">Example 3-3</a> shows how specify a default root element in EclipseLink's OXM metadata format.</p>
	<div class="example"><a id="CIHFDJCE" name="CIHFDJCE"></a><a id="TLJAX190" name="TLJAX190"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 3-3 Specifying a Default Root Element</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	...
	<java-type name="Customer">
	<<strong>xml-root-element</strong>/>
	<java-attributes>
	<xml-element java-attribute="name"/>
	<xml-element java-attribute="billingAddress" name="billing-address"/>
	<xml-element java-attribute="shippingAddress" name="shipping-address"/>
	</java-attributes>
	</java-type>
	...

	</pre></div>
	<!-- class="example" -->
	<a id="TLJAX191" name="TLJAX191"></a>
	<div class="sect2"><a id="sthref58" name="sthref58"></a>
	<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Customizing the Default Root Element</font></h2>
	<p>In <a href="#CIHGHJDA">Example 3-2</a>, our class is called <strong>Customer</strong>, and our root element name in XML is <code>customer</code>. By default, when <code>@XmlRootElement</code> is specified, the name of the class has its first letter lower-cased, and this is set as the root element name. If, however, the element name in XML is different from the Java class name, a name attribute can be included in the annotation (as in <a href="#CIHCGICI">Example 3-4</a>) or OXM metadata (as in <a href="#CIHHJIHH">Example 3-5</a>):</p>
	<div class="example"><a id="CIHCGICI" name="CIHCGICI"></a><a id="TLJAX192" name="TLJAX192"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 3-4 Using Annotations</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	package example;

	import javax.xml.bind.annotation.*;

	<strong>@XmlRootElement</strong>(name="my-customer")
	public class Customer {
	private String name;

	@XmlElement(name="billing-address")
	private Address billingAddress;

	@XmlElement(name="shipping-address")
	private Address shippingAddress;

	...
	}

	</pre></div>
	<!-- class="example" -->
	<div class="example"><a id="CIHHJIHH" name="CIHHJIHH"></a><a id="TLJAX193" name="TLJAX193"></a>
	<p><strong><em><font face="arial, helvetica, sans-serif">Example 3-5 Using OXM Metadata</font></em></strong></p>
	<pre xml:space="preserve" class="oac_no_warn">
	...
	<java-type name="Customer">
	<strong> <xml-root-element name="my-customer"/></strong>
	<java-attributes>
	<xml-element java-attribute="name"/>
	<xml-element java-attribute="billingAddress" name="billing-address"/>
	<xml-element java-attribute="shippingAddress" name="shipping-address"/>
	</java-attributes>
	</java-type>
	...

	</pre></div>
	<!-- class="example" -->
	<p>For more information on JAXB name-binding algorithms, see "Appendix D: Binding XML Names to Java Identifiers" of the Java Architecture for XML Binding (JAXB) Specification (<code><a href="http://jcp.org/en/jsr/detail?id=222">http://jcp.org/en/jsr/detail?id=222</a></code>).</p>
	</div>
	<!-- class="sect2" -->
	<a id="TLJAX194" name="TLJAX194"></a>
	<div class="sect2"><a id="sthref59" name="sthref59"></a>
	<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Understanding How EclipseLink Uses the Default Root Element</font></h2>
	<p>When an instance of the <strong>Customer</strong> class is persisted to XML, the EclipseLink runtime performs the following:</p>
	<ul>
	<li>
	<p>Gets the default root element. The <strong>Customer</strong> class instance corresponds to the root of the XML document. The EclipseLink runtime uses the default root element (<code>customer</code>) specified in either annotations or OXM to start the XML document. EclipseLink then uses the mappings on the class to marshal the object's attributes.</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<customer>
	<name>...</name>
	</customer>

	</pre></li>
	<li>
	<p>When the EclipseLink runtime encounters an object attribute such as <code>billingAddress</code>, it checks the mapping associated with it to determine with what element (billing-<code>address</code>) to continue.</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<customer>
	<name>...</name>
	<billing-address/>
	</customer>

	</pre></li>
	<li>
	<p>The EclipseLink runtime checks the mapping's reference descriptor (<strong>Address</strong>) to determine what attributes to persist.</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<customer>
	<name>...</name>
	<billing-address>
	<street>...</street>
	<city>...</city>
	</billing-address>
	</customer>
	</pre></li>
	</ul>
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