Is it okay to use require_once for libraries which aren't CI 'compatible'?

[eluser]dallen33[/eluser]
My bad, it actually does work:

Code:

$this->load->library(array('form_validation', 'simple_html_dom'));

But to use it, my code has to look like this:

Code:

$html = file_get_html($url);

I was originally trying:

Code:

$html = $this->simple_html_dom->file_get_html($url);