Hi, thanks for posting an interesting project.
Looks like you need to parse this XML and reformat it in a way the wordpress website needs...
I offer you to reformat XML file to CSV and then directly put into the database, that will be easy and safe way to import.
I'm an experienced web develoepr working on PHP/Wordpress websites for over 5+ years and I think I can help you out easily with this task.
Can you share more about your project? For example please send me the xml file you want to import to your website and also the structure of the database.
Please send a message and let's get started ASAP. I can complete this project in next 2 hours.
Thanks.
George.