Udtræk af oplysninger fra fil

Jeg har en gpx-fil  fra min GPS, hvor jeg skal bruge længde og breddegraderne - og have lagt dem i et array.
Filen har denne opbygning:

filnavn: track.gpx

<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="ExpertGPS 3.59" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.topografix.com/GPX/gpx_overlay/0/3 http://www.topografix.com/GPX/gpx_overlay/0/3/gpx_overlay.xsd http://www.topografix.com/GPX/gpx_modified/0/1 http://www.topografix.com/GPX/gpx_modified/0/1/gpx_modified.xsd">
<metadata>
<link href="http://www.garmin.com">
<text>Garmin International</text>
</link>
<bounds minlat="55.65621270" minlon="11.81177310" maxlat="55.69296700" maxlon="11.84501450"/>
<extensions>
<time xmlns="http://www.topografix.com/GPX/gpx_modified/0/1">2010-04-19T15:14:46.593Z</time>
</extensions>
</metadata>
<trk>
<name>ACTIVE LOG 001</name>
<extensions>
<label xmlns="http://www.topografix.com/GPX/gpx_overlay/0/3">
</label>
</extensions>
<trkseg>
<trkpt lat="55.66340890" lon="11.82483180">
<ele>2.541</ele>
<time>2009-04-23T08:46:37Z</time>
</trkpt>
<trkpt lat="55.66339070" lon="11.82460800">
<ele>3.502</ele>
<time>2009-04-23T08:47:16Z</time>
</trkpt>
<trkpt lat="55.66336540" lon="11.82443060">
<ele>3.021</ele>
<time>2009-04-23T08:47:33Z</time>
</trkpt>
<trkpt lat="55.66336110" lon="11.82424730">
<ele>3.502</ele>
<time>2009-04-23T08:47:46Z</time>
</trkpt>
<trkpt lat="55.66337760" lon="11.82404340">
<ele>2.541</ele>
<time>2009-04-23T08:48:03Z</time>
</trkpt>
</trkseg>
</trk>
<extensions>
</extensions>
</gpx>

Arrayet skal blot indeholde tallene for (lat,lon).

Hvordan skal den stump kode, jeg skal bruge se ud?