/* @access public
* @param integer $id The id of a resource.
* @param string $args A query string to append to the generated URL.
* @param mixed $scheme The scheme indicates in what format the URL is generated.<br>
* <pre>
* -1 : (default value) URL is relative to site_url
* 0 : see http
* 1 : see https
* full : URL is absolute, prepended with site_url from config
* abs : URL is absolute, prepended with base_url from config
* http : URL is absolute, forced to http scheme
* https : URL is absolute, forced to https scheme
* </pre>
* @param array $options An array of options for generating the Resource URL.
* @return string The URL for the resource.
*/