On Tue, May 27, 2014 at 01:10:22PM -0400, Kobi Ianko wrote: According to http://libvirt.org/html/libvirt-libvirt.html#virDomainSetMetadata """ ... VIR_DOMAIN_METADATA_ELEMENT @metadata must be well-formed XML belonging to namespace defined by @uri with local name @key. """ so there is no doubt that we must have a properly-defined namespace on the URI. Beyond that, lacking a wiki page explaining the the key, means that a reviewer knows nothing about what is this param, what are its valid values, or how oVirt is using it. Nothing makes sure that no one else in oVirt decides to use the same param for something else. It is important to explain that the params that you suggest are going to be used for communication beween Vdsm and MoM, and that this param is a vm-specific entity. http://ovirt.org/param/name seems like a parameter of ovirt at large, not the CPU of a particular VM. Regards, Dan.