public function render()
{
$output = null;
/* html elements */
$metaElement = new Html\Element();
$metaElement->init('meta');
$collectionArray = self::$_collectionArray[self::$_namespace];
$collectionKeys = array_keys($collectionArray);
$lastKey = end($collectionKeys);
/* process collection */
foreach ($collectionArray as $key => $value) {
$output .= $metaElement->copy()->attr($value);
if ($key !== $lastKey) {
$output .= PHP_EOL;
}
}
$this->clear();
return $output;
}