title: php simple_xml xpath issue for gpx file
body: <p>I try to get the lat and lon's from a gpx file (GPS XML).
  When I do (snippet): $res = $xml->xpath('//*');
     I get the full content returned.
  When I try to narrow down like this: $res = $xml->xpath('//rte');
     I get nothing: array(0) { }.
     Even when the tag(s) exists.
  Actually whatever I try to fill in after // other then * it returns nothing. Have been trying for hours...</p>