@abc.abstractmethod<EOL><INDENT>def get_assessment_part_id(self):<DEDENT>
return<EOL>
Gets the parent assessment ``Id``.

        :return: ``Id`` of an assessment
        :rtype: ``osid.id.Id``
        :raise: ``IllegalState`` -- ``has_parent_part()`` is ``false``

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