Remove session objects with scope-serializer?

How can I remove an object from the session after registering it with
the scope-serializer (shown below)?
Can't leave the input data empty.
thanks
*P

<p:processor name='oxf:scope-serializer'>
   <p:input name="config" >
      <config>
         <key>username</key>
         <scope>session</scope>
      </config>
   </p:input>
   <p:input name="data" href="#new-user#xpointer(/user/username)"/>
</p:processor>



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