<?xml version="1.0"?>
<!DOCTYPE SystemDefinition SYSTEM "sysdef_1_4_0.dtd" [
  <!ENTITY layer_real_source_path "sf/os/usb" >
]>

<SystemDefinition name="usb" schema="1.4.0">
  <systemModel>
    <layer name="os_layer">
      <module name="usb">
        <unit unitID="usbdo.usb" mrp="" bldFile="&layer_real_source_path;/group" name="usb" />
      </module> 
    </layer>
  </systemModel>
</SystemDefinition>