Example 5.3. Full Metadata Document

<?xml version="1.0"?>
<!-- Note that all persistence-capable classes must be listed, but -->
<!-- very few fields need to be specified                          -->
<jdo>
    <package name="org.mag">
        <class name="Magazine" objectid-class="Magazine$MagazineId">
            <field name="isbn" primary-key="true"/>
            <field name="title" primary-key="true"/>
            <field name="articles">
                <collection element-type="Article" dependent-element="true"/>
            </field>
            <fetch-group name="detail">
                <field name="publisher" fetch-depth="0"/>
                <field name="articles" fetch-depth="0"/>
            </fetch-group>
        </class>
        <class name="Article" identity-type="application" detachable="true">
            <field name="id" primary-key="true"/>
            <field name="authors">
                <map key-type="String" value-type="org.mag.pub.Author"/>
            </field>
            <field name="subtitles">
                <collection element-type="String"/>
            </field>
        </class>
    </package>
    <package name="org.mag.pub">
        <class name="Company">
            <field name="address" embedded="true"/>
            <field name="subscriptions">
                <collection element-type="org.mag.subscribe.Subscription"/>
            </field>
            <field name="mags">
                <collection element-type="org.mag.Magazine"/>
            </field>
        </class>
        <class name="Author">
            <field name="address" embedded="true"/>
        </class>
        <class name="Address" embedded-only="true"/>
    </package>
    <package name="org.mag.subscribe">
        <class name="Contract" identity-type="application">
            <field name="id" primary-key="true"/>
        </class>
        <class name="Subscription" detachable="true">
            <field name="items">
                <collection element-type="Subscription$LineItem" dependent-element="true"/>
                <extension vendor-name="kodo" key="lock-group" value="none"/>
            </field>
        </class>
        <class name="LifetimeSubscription"/>
        <class name="TrialSubscription"/>
        <class name="Subscription$LineItem"/>
    </package>
</jdo>