Drivers participating in the 2014 season onwards now have a permanent driver number. For these drivers there is a new PermanentNumber field in the Driver element. However, the value may sometimes differ from the value of the existing position attribute in the Result and QualifyingResult elements. This will occur in earlier seasons or where the reigning champion has chosen to use “1″ rather than his permanent driver number, as Sebastian Vettel has done this year.
To accommodate this change the schema has been updated to: mrd-1.4.xsd