Alias on interfaces

Hi...

Im taking some problems to user alias with interfaces.

I add an alias to Map interface:
Map<String, String> map2 = new LinkedHashMap<String, String>();
map2.put("a", "A");
map2.put("b", "B");
XStream stream = new XStream();
stream.alias("map", Map.class);
System.out.println(stream.toXML(map2));

But for my surprise the toXML gave me this:
<linked-hash-map>
<entry>
<string>a</string>
<string>A</string>
</entry>
<entry>
<string>b</string>
<string>B</string>
</entry>
</linked-hash-map>

I cant have linked-hash-map on this XML, Im using to send data to other language, who dont understand java.

For now I will put alias to all know Map implementations....
xstream.alias("map", HashMap.class);
xstream.alias("map", Hashtable.class);
xstream.alias("map", LinkedHashMap.class);
xstream.alias("map", SortedMap.class);
xstream.alias("map", TreeMap.class);
But this is horrible... and, some genius can implement a UnknowMap and the problem shows again.

I hope is a bug.

VELO