<estates version="0.1">

 <provider name="Foo">
  <estate id="12345678">
   <description>aaa</description>
   <size>300</size>
  </estate>
  <estate id="12345679">
   <description>bbb</description>
   <size>450</size>
  </estate>
 </provider>

 <provider name="Bar">
  <estate id="987654321">
   <description>yyy</description>
   <size>100</size>
  </estate>
  <estate id="987654320">
   <description>zzz</description>
   <size>240</size>
  </estate>
 </provider>

</estates>

@Root
public class Estates {
   @ElementList
   private List<Estate> providers;

   @Attribute
   private String version;
}

public class Estate {
   @Attribute
   private String id;

   @Element(required=false)
   private String description;

   @Element(required=false)
   private Integers size;
}

@ElementList(inline=true)
   private List<Estate> providers;

<estates version="0.1">
 <providerslist>
  <provider name="Foo">
   <estateslist>
    <estate id="12345678">
     <description>aaa</description>
     <size>300</size>
    </estate>
    <estate id="12345679">
     <description>bbb</description>
     <size>450</size>
    </estate>
   </estateslist>
  </provider>
  <provider name="Bar">
   <estateslist>
    <estate id="987654321">
     <description>yyy</description>
     <size>100</size>
    </estate>
     <estate id="987654320">
     <description>zzz</description>
     <size>240</size>
    </estate>
   </estateslist>
  </provider>
 </providerslist>
</estates>