svnadmin dump warning message with --incremental

Are warning messages expected when dumping a single revision using
svnadmin dump with the --incremental flag? What specifically does
this message mean?

% svnadmin dump repos 5 --incremental > /dev/null
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
WARNING: cmp_rev 4 is older than oldest dumped rev 5
... loading this dump into an empty repository will fail.
* Dumped revision 5.

Best,
Blair

-- 
Blair Zajac <blair@orcaware.com>
Web and OS performance plots - http://www.orcaware.com/orca/
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