Um, how far have you gotten? I presume you have some code to show - even if it's just the part that points at the XML file and uses XML::Twig. You probably should have the constructor for XML::Twig, but maybe it's wrong.

I would suggest starting with that. Then reading the XML::Twig documentation. It points to the XML::Twig website, including a quick reference card and a FAQ. These should get you going. Then, if you run into trouble with that, come on back with your code, and we can see how best to help you.

Good luck!

(PS - I also recommend checking out the fabulous help on PM for constructing your nodes...)