<expressions>
 <expression name="dbgserver_sink_serial">
  <and>
   <variable name="dbgserver_serial_enabled"/>
   <variable name="serial_supported"/>
  </and>
 </expression>
 <expression name="dbgserver_sink_xhcidbg">
  <and>
   <variable name="xhcidbg_enabled"/>
   <variable name="xhcidbg_supported"/>
  </and>
 </expression>
</expressions>
