help with custom fdi file/hal callout in f10

[phil]

phil wrote:
> hi there, on fedora10 with hal 0.5.12-14 i'm trying to get some
> powersaving settings changed when the psu is connected/disconnected to
> my acer aspire one laptop. i have written the script that sets these
> powersaving options and i have saved it in
> /usr/lib/hal/scripts/hal-aao-powertweaks then i created the file
> /etc/hal/fdi/policy/30-aaopowertweaks.fdi with the contents
> 
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <deviceinfo version="0.2">
>  <device>
>   <match key="ac_adaptor.present" bool="true">
>    <append key="info.callouts.add"
> type="strlist">/usr/lib/hal/scripts/hal-aao-powertweaks</append>
>   </match>
>  </device>
> 
> <device>
>   <match key="ac_adaptor.present" bool="false">
>    <append key="info.callouts.remove"
> type="strlist">/usr/lib/hal/scripts/hal-aao-powertweaks</append>
>   </match>
>  </device>
> </deviceinfo>
> 
> and re-booted but it doesn't work. can anyone point a relative linux
> newb in the right direction to get this working
> 
> thanks in advance
> phil
> 
> 

does no one who knows how hal works want to give this newbie a pointer 
as to why this doesn't work?