You may want NoAttr for your XMLOut. Then again, you may want to forego XML::Simple for one of the more recommended XML modules like XML::Twig, XML::LibXML, or XML::Rules.

There are also others that look promising at a glance, for that matter, but I've not heard much about them. Any recommendations for or against XML::TreePP, XML::Smart, XML::DOM2 or their comparisons to the ones already mentioned I'd be happy to find somewhere.