public function setNamedListTreatment($namedListTreatment)
	{
		switch ((string) $namedListTreatment)
		{
			case Apache_Solr_Service::NAMED_LIST_FLAT:
				$this->_namedListTreatment = Apache_Solr_Service::NAMED_LIST_FLAT;
				break;

			case Apache_Solr_Service::NAMED_LIST_MAP:
				$this->_namedListTreatment = Apache_Solr_Service::NAMED_LIST_MAP;
				break;

			default:
				throw new Apache_Solr_InvalidArgumentException('Not a valid named list treatement option');
		}
	}