text: """
  @file    gpx.py
  @author  Jakob Erdmann
  @author  Laura Bieker
  @date    2014-02-13
  @version $Id$
  
  This module includes functions for converting SUMO's fcd-output into
  GPX format (http://en.wikipedia.org/wiki/GPS_eXchange_Format)
  
  SUMO, Simulation of Urban MObility; see http://sumo.dlr.de/
  Copyright (C) 2014 DLR (http://www.dlr.de/) and contributors
  
  This file is part of SUMO.
  SUMO is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 3 of the License, or
  (at your option) any later version.
  """
  from __future__ import absolute_import
  from collections import defaultdict
  
  
  def fcd2gpx(inpFCD, outSTRM, ignored):
      tracks = defaultdict(list)
      for timestep in inpFCD:
          for v in timestep.vehicle:
              tracks[v.id].append((timestep.time, v.x, v.y))
  
      outSTRM.write('<?xml version="1.0" encoding="UTF-8"?>\n')
      outSTRM.write('<gpx version="1.0">\n')
      for vehicle in sorted(tracks):
          outSTRM.write("  <trk><name>%s</name><trkseg>\n" % vehicle)
          for timestamp, lon, lat in tracks[vehicle]:
              outSTRM.write('    <trkpt lon="%s" lat="%s"><time>%s</time></trkpt>\n' % (
                  lon, lat, timestamp))
          outSTRM.write("  </trkseg></trk>\n")
      outSTRM.write('</gpx>\n')
  