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  Copyright (C) 2013 Maxime Petazzoni <maxime.petazzoni@bulix.org>
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<html>
  <head>
    <title>leaflet-gpx demo</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.css" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.js"></script>
    <script src="https://rawgithub.com/mpetazzoni/leaflet-gpx/master/gpx.js"></script>
    <style type="text/css">
      #demo-map {
        width: 500px;
        height: 500px;
      }
    </style>
  </head>
  <body>

    <div class="map" id="demo-map"></div>


    <script type="application/javascript">

        var map = L.map("demo-map").setView([50.42, 9.62], 10);

        var osmBase = L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
          attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'
        });


        var mo = {
            startIconUrl: 'http://github.com/mpetazzoni/leaflet-gpx/raw/master/pin-icon-start.png',
            endIconUrl:   'http://github.com/mpetazzoni/leaflet-gpx/raw/master/pin-icon-end.png',
            shadowUrl:    'http://github.com/mpetazzoni/leaflet-gpx/raw/master/pin-shadow.png',
          };

        // ein GPX-Layer
        var gpx1 = new L.GPX("/w1.gpx", {
          async: true,
          marker_options: mo
        });

        // noch eins
        var gpx2 = new L.GPX("/w2.gpx", {
          async: true,
          marker_options: mo
        });

        // und ein drittes
        var gpx3 = new L.GPX("/w3.gpx", {
          async: true,
          marker_options: mo
        });

        // Layergruppe, in die die 3 GPX-Layer zusammengefasst werden
        var lg = new L.LayerGroup([gpx1, gpx2, gpx3]);

        /*
        so geht es auch:
        lg.addLayer(gpx1);
        lg.addLayer(gpx2);
        lg.addLayer(gpx3);
        */

        var control = L.control.layers({"OSM": osmBase}, {"3 Tracks": lg}).addTo(map);

        /*
        Langform für die Overlays:
        control.addOverlay(gpx1, "Track 1");
        control.addOverlay(gpx2, "Track 2");
        control.addOverlay(gpx3, "Track 3");
        control.addOverlay(lg, "Alle zusammen");
        */

    </script>
  </body>
</html>