[Simple-support] ElementMap without entry wrapper?

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Hi folks, I am evaluating Simple for use as the configuration framework for
an application I am writing. I am currently using XStream but I prefer
Simple's explicit mapping vs. XStream's implicit mapping. I am trying to
figure out how to emit a Map that does not include the redundant <entry>
and key information.

Here is my test program:

==
package org.openpnp.app;

import java.io.StringWriter;
import java.util.HashMap;

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.ElementMap;
import org.simpleframework.xml.Root;
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

public class Test {
public static void main(String[] args) throws Exception {
Serializer serializer = new Persister();
StringWriter writer = new StringWriter();
serializer.write(new Machine(), writer);
System.out.println(writer.toString());
}
 @Root
public static class Machine {
@ElementMap(attribute=true, key="id")
private HashMap<String, Head> heads = new HashMap<String, Head>();
 public Machine() {
heads.put("1", new Head("1"));
heads.put("2", new Head("2"));
}
}
 public static class Head {
@Attribute
private String id;
 public Head(String id) {
this.id = id;
}
}
}
==

And the output:

==
<machine>
   <heads>
      <entry id="2">
         <head id="2"/>
      </entry>
      <entry id="1">
         <head id="1"/>
      </entry>
   </heads>
</machine>
==

And what I would prefer the output to look like:

==
<machine>
   <heads>
       <head id="2"/>
       <head id="1"/>
   </heads>
</machine>
==

I expect this to be possible because I am telling Simple that the key field
is id. If it knows that, the entry element and it's id= attribute is
redundant information. I am able to do this quite easily with XStream but I
have not found a way to do it with Simple. Is it possible without writing
my own Map converter?

Thanks,
Jason