svn log -g when dealing with reverse merges specifies the fact with the merged
via line like so:
Reverse merged via: r17
--xml does not have a merged via line because the fact that a change is a merge
and the revision it was merged from is available via XML nesting, however the
fact that the merge is a reverse merge is not.
Reported via this thread on users@:
http://mail-archives.apache.org/mod_mbox/subversion-users/201401.mbox/%3C1B05D8F50421E24799AE93B03CC284BE0202B68587%40CRPMBX01.corp.cbeyond.net%3E
http://mail-archives.apache.org/mod_mbox/subversion-users/201401.mbox/%3C1B05D8F50421E24799AE93B03CC284BE0202B68587%40CRPMBX01.corp.cbeyond.net%3E