trait XmlTrait in Migrate Plus 8.4

trait XmlTrait {

  /**
   * Registers the iterator's namespaces to a SimpleXMLElement.
   *
   * @param \SimpleXMLElement $xml
   *   The element to apply namespace registrations to.
   */
  protected function registerNamespaces(\SimpleXMLElement $xml) {
    if (isset($this->configuration['namespaces']) && is_array($this->configuration['namespaces'])) {
      foreach ($this->configuration['namespaces'] as $prefix => $ns) {
        $xml
          ->registerXPathNamespace($prefix, $ns);
      }
    }
  }

  /**
   * Parses a LibXMLError to a error message string.
   *
   * @param \LibXMLError $error
   *   Error thrown by the XML.
   *
   * @return string
   *   Error message
   */
  public static function parseLibXmlError(\LibXMLError $error) {
    $error_code_name = 'Unknown Error';
    switch ($error->level) {
      case LIBXML_ERR_WARNING:
        $error_code_name = t('Warning');
        break;
      case LIBXML_ERR_ERROR:
        $error_code_name = t('Error');
        break;
      case LIBXML_ERR_FATAL:
        $error_code_name = t('Fatal Error');
        break;
    }
    return t("@libxmlerrorcodename @libxmlerrorcode: @libxmlerrormessage\nLine: @libxmlerrorline\nColumn: @libxmlerrorcolumn\nFile: @libxmlerrorfile", [
      '@libxmlerrorcodename' => $error_code_name,
      '@libxmlerrorcode' => $error->code,
      '@libxmlerrormessage' => trim($error->message),
      '@libxmlerrorline' => $error->line,
      '@libxmlerrorcolumn' => $error->column,
      '@libxmlerrorfile' => $error->file ? $error->file : NULL,
    ]);
  }

}