code: def get_compositions_by_genus_type(self, composition_genus_type):
          
          # Implemented from template for
          # osid.resource.ResourceLookupSession.get_resources_by_genus_type
          # NOTE: This implementation currently ignores plenary view
          collection = JSONClientValidated('repository',
                                           collection='Composition',
                                           runtime=self._runtime)
          result = collection.find(
              dict({'genusTypeId': str(composition_genus_type)},
                   **self._view_filter())).sort('_id', DESCENDING)
          return objects.CompositionList(result, runtime=self._runtime, proxy=self._proxy)
docs: 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.*