@abc.abstractmethod<EOL><INDENT>def get_calendars_by_commitment(self, commitment_id):<DEDENT>
return<EOL>
Gets the list of ``Calendars`` mapped to a ``Commitment``.

        :param commitment_id: ``Id`` of a ``Commitment``
        :type commitment_id: ``osid.id.Id``
        :return: list of calendar ``Ids``
        :rtype: ``osid.calendaring.CalendarList``
        :raise: ``NotFound`` -- ``commitment_id`` is not found
        :raise: ``NullArgument`` -- ``commitment_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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