[libvirt] question about save/restore domain

Hi, my name is Jovanka Gulicoska and I'm SoC student. I'm working on implementing save/load of VM in Gnome-Boxes. Something confused me about snapshots. In the documentation about life cycle, in section about Save/Restore is said that domain saved with virDomainSave/virDomainSaveFlags can be restored only once. But in the documentation about Snapshot XML format there is no information about this in VM state snapshots. So is it better just to use virDomainSnapshotCreateXML instead of virDomainSave/virDomainSaveFlags? I've created bindings for this functions in libvirt-glib but I wanted to be sure before I send them for review. Thanks, Jovanka (gulic)