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Ordinary release have Release values in the form of X. Prereleases, e.g. release candidates, have Release values in the form 0.X. I.e. following Fedora NVR (name, version, release) rules, _ordinary_ releases have NVRs like nfs-ganesha-2.0.0-X.fc21.x86_64.rpm, while prereleases have NVRs like nfs-ganesha-2.0.0-0.X.rcY.fc21.x86_64.rpm. This convention allows the GA updates to apply correctly when someone has installed a prerelease RPM.