@abc.abstractmethod<EOL><INDENT>def is_assessment_over(self, assessment_taken_id):<DEDENT>
return<EOL>
Tests if this assessment is over.

        An assessment is over if ``finished_assessment()`` is invoked or
        the designated finish time has expired.

        :param assessment_taken_id: ``Id`` of the ``AssessmentTaken``
        :type assessment_taken_id: ``osid.id.Id``
        :return: ``true`` if this assessment is over, ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``NotFound`` -- ``assessment_taken_id`` is not found
        :raise: ``NullArgument`` -- ``assessment_taken_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

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