[Libvirt-cim] How LIBVIRT-CIM actually works

Hello, I am a CIM developer and i am interested in LIBVIRT-CIM as a foundation for a futur work, so i have some questions about its design: How the VMs' life cycle methods are mapped with libvirt API? i mean the methods of the class CIM_VirtualSystemManagementService (DefineSystem, DestroySystem, ModifyResourceSettings, ModifySystemSettings, RemoveResourceSettings) What is the relation between the command wirsh and its XML description with the classes CIM_VirtualSystemSettingData, CIM_ResourceAllocationSettingData ? Is the libvirt-cim provider invoking the virsh command ? Thanks in advance Amine Bouabid