Xml is a very dynamic format. Sure, it separates information into tags - but the number of tags and the type of information can vary soooooooooooo much that a simple "parser" is impossible without a context. Do you have an example xml file? And what is the objective?

Those two answers and it will be easy :)

You need an xslt function / library.

XML is far too dynamic for a simple EZ-Script library - specifically due to the limited use cases. It makes more sense for a plugin to be created for the xml file in question.