If you can upload your script you can upload XML::Rules as well. It's pure Perl, a single file and the only dependencies are strict, warnings, Carp and XML::Parser::Expat. The first three are core, I do believe if you have XML::Parser you have the last one.

You can upload the Rules.pm into /some/path/you/have/access/to/lib/XML, add

use lib '/some/path/you/have/access/to/lib';
[download]

on top of your script and you are effectively done with the instalation.