pienso que deberia ser un foreach, obiamente al tratar de implementerlo es donde me euivoco, aqui dejo un ejemplo de gpx con tres registros por las dudas
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3" xmlns:wptx1="http://www.garmin.com/xmlschemas/WaypointExtension/v1" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" creator="eTrex 10" version="1.1" 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.garmin.com/xmlschemas/GpxExtensions/v3 http://www8.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/WaypointExtension/v1 http://www8.garmin.com/xmlschemas/Wa...xtensionv1.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd">
<metadata><link href="http://www.garmin.com"><text>Garmin International</text></link><time>2014-05-23T11:25:26Z</time></metadata>
<wpt lat="-34.904523" lon="-54.931642"><ele>15.331123</ele><time>2014-05-23T11:25:26Z</time><name>001</name><sym>Flag, Blue</sym></wpt>
<wpt lat="-34.904081" lon="-54.931771"><ele>15.963099</ele><time>2014-05-23T11:34:53Z</time><name>002</name><sym>Flag, Blue</sym></wpt>
<wpt lat="-34.904184" lon="-54.932191"><ele>14.877506</ele><time>2014-05-23T11:40:36Z</time><name>003</name><sym>Flag, Blue</sym></wpt>