Function ois 

pub(crate) fn ois(
    name: &str,
    index_code: &str,
    calendar_center: &str,
    fixed_day_count: DayCountFraction,
    fixed_frequency: Frequency,
    business_day_convention: BusinessDayConvention,
    roll: RollConvention,
    spot_lag_days: i32,
    payment_lag_days: i32,
    end_of_month: bool,
) -> OisTemplate

Builder for an OIS template. name doubles as the registry code.