<?xml version="1.0" encoding="UTF-8"?>
<model>
  <entity name="domain-group" root="true">
    <entity-ref name="domain" type="list" names="domains" />
  </entity>
  <entity name="domain">
    <attribute name="id" value-type="String" />
    <entity-ref name="group" type="list" names="groups" />
  </entity>
  <entity name="group">
    <attribute name="id" value-type="String" />
    <element name="ip" value-type="String" type="list" names="ips" />
  </entity>
</model>