Branching & merging an external repository

I'm working on a project where I rely on a third party framework. My own
project as well as the framework are kept in their own subversion
repositories. I have linked in the framework as an external and am
tracking its HEAD version.

As a complication I have changed the framework in several places.
Updates are merged in or result in conflicts, that's fine as it is.
What I'm scratching my head about is how to keep my changes under
version control. I haven't found a way to do this, but my subversion
skills are only somewhat basic. As I'm routinely updating the framework
from its repository, I'm looking for an easy, automatic procedure.

I've searched the mailing list archive and this question appears to have
come up before, However the best advice I found was to switch to svk,
which is not what I want to do.

Michael

-- 
Michael Schuerig                            You can twist perceptions
mailto:michael@schuerig.de                        Reality won't budge
http://www.schuerig.de/michael/               --Rush, Show Don't Tell
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