org.freedesktop.Hal.Manager.GetAllDevices introspection format "ao"

[Richard Hughes]

I've been auditing the introspection stuff used in HAL, and I've found
an oddity:

  <interface name="org.freedesktop.Hal.Manager">
    <method name="GetAllDevices">
      <arg name="devices" direction="out" type="ao"/>
    </method>
    ....

Why are we using 'ao' (array of pointer objects) rather than 'as' (array
of strings) as we just get back a list of udi's?

[hughsie at hughsie-laptop tools]$ dbus-send --system
--dest=org.freedesktop.Hal --print-reply /org/freedesktop/Hal/Manager
org.freedesktop.Hal.Manager.GetAllDevices
method return sender=:1.117 -> dest=:1.118
   array [
      string "/org/freedesktop/Hal/devices/acpi_lcd"
      string "/org/freedesktop/Hal/devices/acpi_PWRF"
...
      string "/org/freedesktop/Hal/devices/computer"
   ]

Thanks,

Richard.