Horde_Xml_Element::registerNamespace PHP Method

    public static function registerNamespace($prefix, $namespaceURI)
    {
        self::$_namespaces[$prefix] = $namespaceURI;
    }

 /**
  * Constructor.
  *
  * @param resource|string $xml The XML document received from the server.
  */
 public function __construct($xml)
 {
     if (is_resource($xml)) {
         rewind($xml);
         $xml = stream_get_contents($xml);
     }
     parent::registerNamespace('xlink', 'http://www.w3.org/1999/xlink');
     parent::__construct($xml);
 }