Thanks for the reply I hope this makes things a tad bit clearer
What I want to do is to parse the consisting xml files so I would like to find each file and make them into objects (I guess) and from here on use either Xpath or similiar packages/functionalities to manipulate the xml files.
So practically what I need is to do is:
-change the file extension to zip
-find the files within the small library inside the zip file
-create objects or temporary files of each these to be able to manipulate them