jpa/eclipselink.jpa.test/resource/eclipselink-extensibility-model/persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd" version="1.0">
    <persistence-unit name="extensibility" transaction-type="RESOURCE_LOCAL">
        <provider>
            org.eclipse.persistence.jpa.PersistenceProvider
        </provider>
        <properties>
            <property name="eclipselink.ddl-generation" value="create-or-extend-tables"/>
            <property name="eclipselink.metadata-source.xml.file" value="extension.xml"/>
            <property name="eclipselink.metadata-source" value="XML"/>
            <property name="eclipselink.cache.shared.default" value="false"/>
        </properties>

        <exclude-unlisted-classes>false</exclude-unlisted-classes>
    </persistence-unit>
</persistence>