760: [fixingDates] should have [relativeDates] not [relativeDate]

Currently the [fixingDates] under the interest leg is of type [AdjustableDatesOrRelativeDateOffset], which has a choice element with [adjustableDates] and [relativeDate]. The latter should be [relativeDates] of type [RelativeDates] rather than [relativeDate] of type [RelativeDateOffset], as they are expected to result in multiple dates. (Note that this change will not be backward-compatible.)

671: Incorrect element name

In the section 9.8.2 of fpml-4-3-11-rec-1, [interestRateResetDates] and [interestRatePaymentDates] are mentioned a few times but it seems to me they should be [interestLegResetDates] and [interestLegPaymentDates] respectively.