DataNucleus supports persistence to heterogeneous datastores and this plugin provides persistence to XML.
'org.datanucleus:datanucleus-xml:1.0.7'
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-xml</artifactId>
<version>1.0.7</version>
</dependency>
<dependency org="org.datanucleus" name="datanucleus-xml" rev="1.0.7"/>
"org.datanucleus", "datanucleus-xml", "1.0.7"