Better repodata performance

[Charles R. Anderson]

On Sat, Jan 29, 2005 at 05:54:48PM -0600, David Farning wrote:
> Now, in most situations very few packages have been changed. Therefore, 
> between primary.xml versions few <package>...</packages> have changed 
> thus most of the information in primary.xml is redundant against 
> previous versions of primary.xml.

Why all the complication when a general-purpose algorithm, rsync,
already exists to solve this problem?  Using rsync or librsync would
require no changes to the repodata...