public function load($source, $contentType, $options = [])
{
$dom = NULL;
foreach ($this as $loader) {
/**
* @var Loadable $loader
*/
if ($loader->supports($contentType) && ($dom = $loader->load($source, $contentType, $options))) {
break;
}
}
return $dom instanceof \DOMDocument || $dom instanceof Result ? $dom : NULL;
}