change format to text (XML) in external diff (but no external diff for ceckout and commit )

Hello,

Before I send OpenOffice Documents to SVN, I extract the zip file (ODA)
and insert newlines into the XML-files.
So I need less space in the repository and a diff can tell me what is
really changed.

Than I try to make this explicit (on the fly) with SVN.
*svn up* and *svn diff *has as feature external diff, but for *svn
commit* and *svn checkout* I miss such a feature.

What I want is, that only the textual XML-diffs are sent and received
between client an server.
Has someone a solution (patch) for this ?

The next Question is, that windows user need this in TortoiseSVN .
Or is a better solution to implement a mime-type dependant conversion on
server side?

-- 
Mit freundlichen Grüßen
Martin Helmling
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