Convert XML into comma separated file. XSD provided

Hi, I have a lot of data stored in XML files that come with a few XSD schema files. These data should be stored in a comma-separated file, so that I can import it with other programs, e.g. MS Excel etc. Attached are the XSD files, a sample of the XML files will be provided upon assignment. The same task will be required for two sets of data. If this project is successful, I am happy assign the next task to the same person, which should take a lot less time. Best, Phil