I'm former FileMaker employee, worked at FileMaker about 6 years, so I know almost every bit of FileMaker.
I'am expert at filemaker integration with third party software. You can check my previous finished project, in which I help to integrate FileMaker and Google service. https://www.freelancer.com.au/projects/json/Answer-how-attach-pdf-google-16313952/
So I'm I can also help you to export FileMaker Data into XML format perfectly.
I guarantee high qualification and deadline. Thank you for your consideration.