Return the abbreviated character-string representation of the enumerator corresponding to the specified convention. This representation matches the enumerator's name (e.g., e_ACTUAL_360) with the "e_" prefix elided. For example: ` bsl::cout << bbldc::DayCountConvention::toAscii( bbldc::DayCountConvention::e_ACTUAL_360); ` prints the following on standard output: ` ACTUAL_360 ` Note that specifying a convention that does not match any of the enumerators will result in an unspecified string representation being returned that is distinct from the values returned for any valid enumerator.