This format can...
read and write waypoints
read and write tracks
read and write routes
This is the most capable and expressive of all the file formats supplied. It is described at topografix.com and is supported by EasyGPS, ExpertGPS, and many other programs described at topografix.com
GPSBabel's reader of this module attempts to preserve tags it doesn't really understand. It also tries to glean interesting data from pocket queries from Geocaching.com.
Target GPX version for output.
This option specifies the version of the GPX specification to use for output. The default version is 1.0. The only other valid value for this option is 1.1.
Notice that this is not a full scale XML schema conversion. In particular, if you have a GPX 1.0 file that has extended namespaces in it (such as a pocket query from Geocaching.com) just writing it with this option will result in a horribly mangled GPX file as we can't convert the schema data.