Should this file resolve or not?

<?xml version="1.0"?>
<cdl:cdl xmlns:cdl="http://www.gridforum.org/namespaces/2005/02/cddlm/CDL-1.0"
  xmlns="http://example.org/webapps" >
  <cdl:configuration>
    <server>
      <port>8080</port>
      <security>true</security>
      <webapps/>
    </server>

  </cdl:configuration>
  <cdl:system>

    <tomcat cdl:extends="server">
      <basedir>
      </basedir>
    </tomcat>
  </cdl:system>
</cdl:cdl>

This file fails to resolve extends="server" because the  xmlns="http://example.org/webapps" declaration puts the     
server declaration into that ns. 

My extends lookup logic assumes that any localname without a namespace is in the empty namepace. 

Question is, is that the right assumption?

The other, perfectly valid one, would be to say that any localname in an extends declaration is in the same namespace as
 the element that is being extended. To get something in the empty namespace, I'd have to say extends=":something". 
.