Determining file(s) modified in a changeset

I need to modify a script that was used with CVS that basically got a
list of the files that changed with a specific tag, and acted upon them.
Now we're moving to Subversion, and I need a way to get a list of files
that changed with a tag or revision.

Should I just force the developers into using the revision instead of
the tag? The tag contains every file in that module, so it doesn't help
in this matter.

And is there a way to get a list of files that changed with a changeset
(revision) without having to heavily parse the log output?
I need to list the files that changed in a file to be consumed by
another process, and the file contents need to be just the filename one
on each line. Is there an easy way to do this?

Thanks!

-- 
"Dingo" Dave Bartmess
Broomfield, CO. USA
http://edingo.net