Namespaces in XML

[leatherback]

Dear All,

I am working on an XML parser. However, I now am stuck on getting the values only in case no namespaces are set for a certain node, or when the namespace is set to xml:lang="en". I have no idea how to get this working.

I am now using these two functions:

// one example file: 
$xmlUrl = http://www.utwente.nl/master/hodexdata/?get=BK


function get_programme_info4($xmlUrl)
  {
  // ensure right URL
  echo $xmlUrl."<br />";

  // Load the document
  $dom = new DomDocument();
  $dom->load($xmlUrl);

  // get tuition fee
  $TuitionInfo = get_node_info($dom, 'tuitionFee', array('amount', 'period', 'programForm', 'year'));

  // Get programme info
  $ProgrammeInfos = get_node_info($dom, 'programDescriptions', array('programName', 'programDescription'));
  }

function get_node_info($dom, $NodeName, $fields)
  {

  // http://www.php.net/manual/en/domdocument.getelementbyid.php

  $out = array();

  $params = $dom->getElementsByTagName($NodeName);

  $k=0;

  foreach($params as $p)
    {
	echo "<p>";
	$sub = array();

foreach($fields as $field)
  {
  echo $field;

/* The following line works. However, when multiple languages are defined, this is typically not the right one. So try to get namespaces involved. Then however it fails.
*/

//	  $nodes = $params->item($k)->getElementsByTagName($field);

  $nodes = $params->item($k)->getElementsByTagNameNS('xml:lang="en"', $field);
  $sub[$field] = $nodes->item(0)->nodeValue; 
  echo "<br />".$sub[$field];
  }
echo "</p>";  
$k++;  
}
  }	

The errors I get with this script:

http://www.utwente.nl/master/hodexdata/?get=BK

amount
Notice: Trying to get property of non-object in C:\xampp\htdocs\degrees\includes\functions\hodex\hodex_index_functions.php on line 213

period
Notice: Trying to get property of non-object in C:\xampp\htdocs\degrees\includes\functions\hodex\hodex_index_functions.php on line 213

programForm
Notice: Trying to get property of non-object in C:\xampp\htdocs\degrees\includes\functions\hodex\hodex_index_functions.php on line 213

year
Notice: Trying to get property of non-object in C:\xampp\htdocs\degrees\includes\functions\hodex\hodex_index_functions.php on line 213

etc...