For all OTA versioned messages, the version of the message is indicated by a decimal value.
OTA requires the usage of this field, should correspond to the schema version
used, the number includes 1 major 3 minor digits. All version numbers are at
http://wiki.opentravel.org/index.php/Public:Specification_Version_Table.
HotelDescriptiveContentNotifRQ - 6.003
HotelDescriptiveContentNotifRS - 1.008
HotelDescriptiveContentNotifRQ - 1.009
HotelDescriptiveContentNotifRS - 6.003
HotelRatePlanNotifRQ - 5.002
HotelRatePlanNotifRS - 1.006
HotelRatePlanRQ - 1
HotelRatePlanRS - 1.001
HotelAvailNotifRQ - 2.002
HotelAvailNotifRS - 1.008
HotelAvailNotifRQ - 2.003
HotelAvailNotifRS - 5
HotelResNotifRQ - 4
HotelResNotifRS - 4
ReadRQ - 1.01
ResRetrieveRS - 5