Hi,

I just found that there is tiny mistake in comps.xml

curl
http://ftp.scientificlinux.org/linux/scientific/7.4/x86_64/os/repodata/comps-sl7-x86_64.xml
2>/dev/null  | xmllint --format - | grep -i 'red hat'
returns some entries with Red Hat branding. I checked it and these lines
should be with SL (other descriptions has Scientific Linux.).

Bests,
Alex