this probably should go in the other *nix/*bsd subforum.
i am not sure what apple script is but based on your post above it is nothing like bash script so i dont think it is cron
-able. xml is not an executable format, it is a mark-up language and relies on something like a web browser to render it.
if macs have cron
(i beleive they do), try something like:
30 21 * * * chromium-browser hyper.homeftp.net
would write-quit out of vi
man crontab for more info.