<models xmlns:xi="http://www.w3.org/2001/XInclude">
  <model name="F_FRAG">
    <input_ports>
      <port name="F1" combinational_sink_ports="FZ"/>
      <port name="F2" combinational_sink_ports="FZ"/>
      <port name="FS" combinational_sink_ports="FZ"/>
    </input_ports>
    <output_ports>
      <port name="FZ"/>
    </output_ports>
  </model>
</models>