/**
  * Constructor.
  * 
  * @since 0.7
  */
 public function __construct()
 {
     parent::__construct();
 }
 /**
  * Constructor.
  * 
  * @since 0.4
  */
 public function __construct($delimiter = ',', $wrapper = '')
 {
     parent::__construct();
     $this->delimiter = $delimiter;
     $this->wrapper = $wrapper;
 }
 /**
  * Constructor.
  *
  * @param string $groupNameSeparator Separator between layer group and the
  *        layers name within the group.
  *
  * @since 0.7
  */
 public function __construct($groupNameSeparator = ';')
 {
     parent::__construct();
     $this->groupNameSep = $groupNameSeparator;
 }