@abc.abstractmethod<EOL><INDENT>def get_assessments_taken(self):<DEDENT>
return<EOL>
Gets the assessment taken list resulting from the search.

        :return: the assessment taken list
        :rtype: ``osid.assessment.AssessmentTakenList``
        :raise: ``IllegalState`` -- the assessment taken list has already been retrieved

        *compliance: mandatory -- This method must be implemented.*