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.
xerces-c-2_8_0-2_fc9:HEAD:xerces-c-2.8.0-2.fc9.src.rpm:1214829476 xerces-c-2_8_0-5_fc11:F-10:xerces-c-2.8.0-5.fc11.src.rpm:1249567159