GPX
From OpenTom
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GPX File format
GPX (the GPS Exchange Format) is a light-weight XML data format for the interchange of GPS data (waypoints, routes, and tracks) between applications and Web services on the Internet. Find more information at http://www.topografix.com/gpx.asp
GPX files should pass the validation described at http://www.topografix.com/gpx_validation.asp
A GPX file can include zero or more <wpt> (waypoints) and/or zero or more <trk> sections with optional <trkseg> (track points).
See also: TTTracklog
