[libvirt-users] Libvirt disk API

Hi all: I am studying Libvirt API , I am wondering the API about the disk manage is TBD(to be difine). The edition is libvirt 0.7.5 ,but the edition is too old ,The website is http://libvirt.org/guide/html/Application_Development_Guide-Introduction.... So, if I want to manage the VM disk , for example read the disk, what should I do ? Sincerely thanks a lot