function createComment() {
    $cnt = count( $this->comment );
     if( 0 >= $cnt )
      return;
    $comment = null;
    foreach( $this->comment as $commentPart ) {
      $attributes = $this->_createParams( $commentPart['params'], array( 'ALTREP', 'LANGUAGE' ));
      $content    = $this->_strrep( $commentPart['value'] );
      $comment   .= $this->_createElement( 'COMMENT', $attributes, $content );
    }
    return $comment;
  }