How to find the Volume is in use or not using XML API

Hi

How to find the Volume is in use or not using XML API. Thru CLI I am getting the volume is in use or not

id          = 9

name        = root_slice_1

acl         = 0

in_use      = True

type        = slice

slice_name  = root_slice_1

slice_of    = root_disk

offset(MB) = 135

size  (MB) = 16

disks       = root_disk

clnt_volume = root_volume_1

size        = total = 16 avail = 0 used = 16 ( 100% ) (sizes in MB)

I am getting the in use property thru XML API.

 

           

       

Can you please help me where i can find it.

Thanks

naren