the modules are designed to work as independantly of each other as possible, the session var could be told

  <session add="foo"><qd>bar</qd></session>
  
  or

  <session add="foo"><case c="<qd>bar</qd>">
                       <refa>something</refa>
                       <refb>something else</refb>
                     </case></session>

  or 

  <session <qd>ses_action</qd>="foo">some data</session>
  
  where ses_action is one of ; add ; del ; append etc
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</code>