Function read_option 

pub(crate) fn read_option<'a, 'd>(
    trade: El<'_, '_>,
    option: El<'a, 'd>,
    trade_date: NaiveDate,
    ctx: &Context<'_>,
) -> Result<Read<'a, 'd>, FpmlError>

Reads a creditDefaultSwapOption: an option on its contract, its premium a fee.