[libvirt-users] libvirt java api create volume bug?

hi,all I use libirt Java AP { pool.storageVolCreateXML(xml,0)} to create a volume ,notice:here I define the format is "qcow2", the xml file is : <volume> <name>volume8</name> <capacity unit="KB">512000</capacity> <target> <format type="qcow2" /> </target> </volume> when use command check the volume's format, root@60:/dev/vgtest2# qemu-img info volume8 image: volume8 file format: raw virtual size: 500M (524288000 bytes) disk size: 0 I think this is a bug.can you fix it? the libvirt version is 0.9.8 libivrt-java version is 0.4.9 os:ubuntu12.04 thanks liuzhijun