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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>元數據更新</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr> 第 3 頁（共7 頁）</nobr></font></td>
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<p>一般而言，元數據更新就是將附加類添加到元數據中這樣的操作，如下所示：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
<?xml version="1.0"?>
<!DOCTYPE jdo SYSTEM "jdo.dtd">
<jdo>
<package name="com.stereobeacon.jdo.tutorial">
<class name="AddressImpl">
<field name="addressLine1"/>
<field name="addressLine2"/>
<field name="city"/>
<field name="state"/>
<field name="zip"/>
</class>
<class name="PersonImpl">
<field name="employeeId" primary-key="true"/>
<field name="address"/>
<field name="email"/>
<field name="firstName"/>
<field name="lastName"/>
<field name="homePhone"/>
</class>
<class name="ManagerImpl"
persistence-capable-superclass=
"com.stereobeacon.jdo.tutorial.PersonImpl">
</class>
<class name="DepartmentImpl">
<field name="departmentName"/>
<field name="employees">
<collection element-type="com.stereobeacon.jdo.tutorial.PersonImpl"/>
</field>
<field name="manager"/>
</class>
</package>
</jdo>
</code>
</pre>
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