/**
* Start this question attempt, starting from the point that the previous
* attempt $oldqa had reached.
*
* You should not call this method directly. Call
* {@link question_usage_by_activity::start_question_based_on()} instead.
*
* @param question_attempt $oldqa a previous attempt at this quetsion that
* defines the starting point.
*/
public function start_based_on(question_attempt $oldqa)
{
$this->start($oldqa->behaviour, $oldqa->get_variant(), $oldqa->get_resume_data());
}