[libvirt] How to differentiate creation from migration?

Hi, I work on a project that makes use of libvirt (called libvirt-cim) and we created an algorithm to detect when a new machine is created. However, I need to filter the ones created by the migration operation. Does libvirt provides a way to distinguish a machine created by 'migrate' command from a machine created by the 'define' command (virDomainDefineXML API call)? Thanks in advance, Richard Maciel