public function setRows(array $rows)
    {
        if (isset($rows['_head'])) {
            $this->setHeading($rows['_head']);
            unset($rows['_head']);
        }
        
        if (!empty($rows)) {
            foreach($rows as $row) {
                $this->setRow($row);
            }
        }
        
        return $this;
    }