API question: client-side transaction creation

I'd like to find or write a program that uses Subversion APIs to
perform multiple mkdir/copy/move operations in a single transaction at
that runs from the client side rather than the repository side. I'm
aware of RSVN which has basically the functionality I'm looking for
but runs from the repository side. Is anyone aware of a program that
does this from the client side? If not, I'm planning on reading
HACKING and understanding the subversion APIs well enough to write
this. I'm assuming it must be possible to do this with the existing
subversion APIs because any commit would have to essentially do this.
Any quick pointers would be appreciated, though since I haven't yet
read through all the available information, I'm not looking for
hand-holding. I'm merely trying to make sure I don't do any major
wheel reinvention, though there is something to be said for wheel
reinvention for its learning value. :-)

-- 
Jay Berkenbilt <ejb@ql.org>
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