Hello Scientific Linux folks,
How are you generating the updates repos' updateinfo.xml? (updateinfo.xml.gz)
I had thought it came only from official Red Hat Network (RHN) repositories or their projects EPEL or Fedora, but I see it in Scientific Linux:
* SCL 5.10:
http://linuxsoft.cern.ch/cern/slc510/updates/x86_64/RPMS/repodata/
* SCL 6.5:
http://linuxsoft.cern.ch/cern/slc65/updates/x86_64/RPMS/repodata/
Shatil (@shatil)