public function getSortationString( array $types, array $translations = array() )
	{
		if( empty( $this->_sortations ) )
		{
			reset( $types );

			if( ( $name = key( $types ) ) === false ) {
				throw new MW_Common_Exception( 'No sortation types available' );
			}

			return $this->sort( '+', $name )->toString( $types, $translations );
		}


		$sortation = array();

		foreach( $this->_sortations as $sortitem )
		{
			if( ( $string = $sortitem->toString( $types, $translations ) ) !== '' ) {
				$sortation[] = $string;
			}
		}

		return implode( ' ', $sortation );
	}