Create XML/PHP datafeed from Zencart database tables

We need to generate a datafeed from our Zencart website. The website requires a dynamically created XML file with certain information populated from the database. I have uploaded the XML format that needs to be reproduced. We are looking for an expert with Zencart, PHP, MYSQL and XML. The Zencart website is a standard ecommerce website. If you have any experience in webgains affiliate marketing feeds then that would be great but not essential - key thing is to be able to create the feed. See the attached feed requirements for the feed - we need a php file to generate the XML file whenever it is called. Any questions let me know.