Detecting whether a particular subversion URL's content has changed

Hi all,

I have a rather strange request, and the docs so far haven't uncovered
anything I can use.

I have a number of projects within an svn repo, the documentation for
which is built with maven plugins. Every night, the docs get rebuilt, so
that up to date manuals are always available for trunk and all branches
of our projects via http. The trouble is that all documentation is
regenerated every night, which with a rapidly expanding list of
branches, is a lot of unnecessary processing.

What I would like to do, is given an URL into a repository, I would like
to get a list of all files that have changed recursively below that URL
since the date/time specified. If the list is empty, there has been no
change, and a script can decide not to regenerate documentation
unnecessarily.

Is this possible somehow?

Regards,
Graham

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