Hey Kevin,
I actually emailed the other Kevin and got a really useful response. He said the XML export (and the files he had on his site) are for exporting sequences. To put all the clips in your bin into FileMaker to manage them, export them as a Batch List. That exports everything as a simple tab delimitated file. Then import that into FMP, no XSLT required. It’ll have all the data that’s in the the different columns (description, log note, start time, end time, etc.) in the order that you have it arranged in FCP.
I did this and it worked great. You can also re-export it from FMP and send the info back to FCP.