This is a persistence.xml used as a template to configure a JPA store with a datasource provided in the configuration.

<jpa-store data-source="jboss/datasources/ExampleDS">
    <supported-types supports-all="true"/>
</jpa-store>

The jta-data-source is not really necessary here, because we configure it in runtime using the JNDI url provided in the model. Going to remove it.