These two fields allow to specify a different default assignee for ticket opened against this package in bugzilla. Note: The EPEL field is always displayed for packages in the 'rpms' namespace regardless of whether it is used in bugzilla or not.
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doc package needs to require common package, because of licensing http://lists.fedoraproject.org/pipermail/devel-announce/2010-July/00063 1.html