Description:
------------
If a XML node have a - in it you can't get the data from it
<display-name>

echo $channel->display-name;
Notice: Use of undefined constant name - assumed 'name'

Test script:
---------------
<?xml version="1.0" encoding="UTF-8" ?>
<tv generator-info-name="www.ontv.dk/xmltv">
  <channel id="www.ontv.dk/tv/1">
    <display-name lang="dk">DR1 DK</display-name>
  </channel>
</tv>

$xml = simplexml_load_string($xml);
$channels = $this->xml->xpath('//channel');
foreach($channels AS $channel) {
  echo $channel->display-name;
}

Expected result:
----------------
DR1 DK

Actual result:
--------------
Notice: Use of undefined constant name - assumed 'name'