@abc.abstractmethod<EOL><INDENT>def get_compositions_by_parent_genus_type(self, composition_genus_type):<DEDENT>
return<EOL>
Gets a ``CompositionList`` corresponding to the given composition genus ``Type`` and include any additional compositions with genus types derived from the specified ``Type``.

        :param composition_genus_type: a composition genus type
        :type composition_genus_type: ``osid.type.Type``
        :return: the returned ``Composition list``
        :rtype: ``osid.repository.CompositionList``
        :raise: ``NullArgument`` -- ``composition_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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