@abc.abstractmethod<EOL><INDENT>def get_configuration_hierarchy(self):<DEDENT>
return<EOL>
Gets the hierarchy associated with this session.

        :return: the hierarchy associated with this session
        :rtype: ``osid.hierarchy.Hierarchy``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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