Sadly, the known tags have not been updated for current rpms. This causes error messages that are output by the module to STDERR -- even though the actual fields that I wanted to read from an rpm file (name and version) were known and worked.
But with the spurious output on STDERR the module is not really usable.
Sad, it looked like a great module.
(Interface is rated `3', because an OO-style interface would have been more in style with current practice.)