token
      <simpleType name="operatingSystemFamiliesStringType" >
  <restriction base="token">
    <enumeration value="Win9xFamily" />              <!--Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition-->
    <enumeration value="WinNt4Family" />             <!--Windows NT Server 4.0, Windows NT Workstation 4.0-->
    <enumeration value="Win2kFamily" />              <!--Windows 2000 Professional, Windows 2000 Server, Windows 2000 Advanced Server, Windows 2000 Datacenter Server-->
    <enumeration value="WinXpFamily" />              <!--Windows XP Home Edition, Windows XP Professional, Windows XP Media Center, Windows XP Tablet PC-->
    <!--<enumeration value="WinCeFamily"/> -->             <!--Windows CE .NET (and previous versions)-->
  </restriction>
</simpleType>