@utilities.arguments_not_none<EOL><INDENT>def get_compositions_by_genus_type(self, composition_genus_type):<DEDENT>
<EOL>collection = JSONClientValidated('<STR_LIT>',<EOL>collection='<STR_LIT>',<EOL>runtime=self._runtime)<EOL>result = collection.find(<EOL>dict({'<STR_LIT>': str(composition_genus_type)},<EOL>**self._view_filter())).sort('<STR_LIT>', DESCENDING)<EOL>return objects.CompositionList(result, runtime=self._runtime, proxy=self._proxy)<EOL>
Gets a ``CompositionList`` corresponding to the given composition genus ``Type`` which does not include compositions of types derived from the specified ``Type``.

        arg:    composition_genus_type (osid.type.Type): a composition
                genus type
        return: (osid.repository.CompositionList) - the returned
                ``Composition list``
        raise:  NullArgument - ``composition_genus_type`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*