I tried reading the RT file in this zip http://users.telenet.be/meirenwi/Achterbroek%20naar%20De%20Maatjes%20-%2013%20km%20RT.zip, and I had to remove the bounds element to make it load. With this element I got a NPE. I believe the schema at http://www.topografix.com/GPX/1/0/gpx.xsd indicates the bounds element is legal.