Method initialise

/**
 * Method to initialise the feed for parsing.  Here we detect the version and advance the stream
 * reader so that it is ready to parse feed elements.
 *
 * @return  void
 *
 * @since   3.1.4
 */
protected function initialise()
{
    // Read the version attribute.
    $this->version = $this->stream->getAttribute('version');
    // We want to move forward to the first element after the <channel> element.
    $this->moveToNextElement('channel');
    $this->moveToNextElement();
}