how to suggest filesystem type for a volume?

[Artem Baguinski]

i'd like to force filesystem type on my portable audio player to vfat 
instead of msdos.

the following is the output of lshal:

udi = '/org/freedesktop/Hal/devices/block_8_1'
   volume.mount_point = '/media/lyra'  (string)
   info.udi = '/org/freedesktop/Hal/devices/block_8_1'  (string)
   volume.is_filesystem = true  (bool)
   volume.is_mounted = true  (bool)
   volume.is_disc = false  (bool)
   volume.uuid = ''  (string)
   volume.label = ''  (string)
   volume.fstype = 'msdos'  (string)
   info.product = 'Volume (msdos)'  (string)
   block.storage_device = '/org/freedesktop/Hal/devices/block_8_0'  (string)
   block.minor = 1  (0x1)  (int)
   block.major = 8  (0x8)  (int)
   info.capabilities = 'block volume'  (string)
   info.category = 'volume'  (string)
   info.parent = '/org/freedesktop/Hal/devices/block_8_0'  (string)
   block.device = '/dev/sda1'  (string)
   block.is_volume = true  (bool)
   block.have_scanned = false  (bool)
   block.no_partitions = false  (bool)
   linux.sysfs_path_device = '/sys/block/sda/sda1'  (string)
   linux.sysfs_path = '/sys/block/sda/sda1'  (string)
   info.bus = 'block'  (string)

udi = '/org/freedesktop/Hal/devices/block_8_0'
   info.udi = '/org/freedesktop/Hal/devices/block_8_0'  (string)
   storage.hotpluggable = true  (bool)
   storage.removable = false  (bool)
   storage.drive_type = 'lyra'  (string)
   info.product = 'PDP2444_48Player'  (string)
   info.vendor = 'Thomson'  (string)
   block.storage_device = '/org/freedesktop/Hal/devices/block_8_0'  (string)
   storage.physical_device = 
'/org/freedesktop/Hal/devices/usb_usb_device_69b_300c_1_-1_3870D882401E0000_0' 
  (string)
   storage.vendor = 'Thomson'  (string)
   storage.model = 'PDP2444_48Player'  (string)
   storage.automount_enabled_hint = true  (bool)
   storage.no_partitions_hint = false  (bool)
   storage.media_check_enabled = true  (bool)
   storage.bus = 'usb'  (string)
   block.minor = 0  (0x0)  (int)
   block.major = 8  (0x8)  (int)
   info.capabilities = 'block storage'  (string)
   info.category = 'storage'  (string)
   info.parent = '/org/freedesktop/Hal/devices/scsi_5_0_0_0'  (string)
   block.device = '/dev/sda'  (string)
   block.is_volume = false  (bool)
   block.have_scanned = true  (bool)
   block.no_partitions = false  (bool)
   linux.sysfs_path_device = '/sys/block/sda'  (string)
   linux.sysfs_path = '/sys/block/sda'  (string)
   info.bus = 'block'  (string)

this is the thompson-lyra.fdi i'm using now:

<?xml version="1.0" encoding="ISO-8859-1"?> <!-- -*- SGML -*- -->

<deviceinfo version="0.2">
   <device>
     <match key="storage.model" string="PDP2444_48Player">
           <merge key="storage.drive_type" type="string">lyra</merge>
     </match>
   </device>

   <device>
     <match key="usb_device.vendor_id" int="0x069b">
       <match key="usb_device.product_id" int="0x300c">
         <merge key="info.capabilities" 
type="string">portable_audio_player</merge>
         <merge key="info.category" 
type="string">portable_audio_player</merge>
         <merge key="portable_audio_player.output_formats" 
type="string">audio/mpeg audio/x-ms-wma</merge>
       </match>
     </match>
   </device>
</deviceinfo>

i'd like to say in a first device "for all children set volume.fstype = 
'vfat'"

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