[Yum] yumgroups.xml - needs to be in each repository?

[Jeff Sheltren]

Hi, I have a couple of questions about the yumgroups.xml file.  But
first, I have to say that the groupupdate works great - I'm glad that
feature has been included.

Anyway, it seems that yum looks for the yumgroups.xml file in each and
every repository.  I suppose this makes sense, as it could be put
anywhere, but this brings up some questions:

1) If yum finds the yumgroups.xml file in one repository, does it really
need to look for it in the rest of the repositories?  When yum finds a
repository without the yumgroups.xml file it complains:
retrygrab() failed for:
  ftp://foobar.cs.ucsb.edu/updates-9/yumgroups.xml
  Executing failover method

So, why not stop looking for the file if it's already seen it in another
repository?  Which leads me to the next question:

2) Theoretically, what happens if two yumgroups.xml files are found and
they define the same group with different packages?  Or if a group is
defined in one and not in the other?

Thanks,
Jeff